Ari Arnbjörnsson
@flassari.bsky.social
Senior Software Engineer, Developer Relations at Epic Games.
Former Lead Programmer on #Returnal for #PS5 @Housemarque.
https://ari.games for my presentations!
Former Lead Programmer on #Returnal for #PS5 @Housemarque.
https://ari.games for my presentations!
Reposted by Ari Arnbjörnsson
I'll be presenting with the awesome @highlyspammable.bsky.social
at the GDC26!! Come say hi :D
Developing Large Procedural Systems with Low Friction and Fast Generation (Presented by Epic Games) #GDC2026 #PCG #UE
schedule.gdconf.com/session/deve...
at the GDC26!! Come say hi :D
Developing Large Procedural Systems with Low Friction and Fast Generation (Presented by Epic Games) #GDC2026 #PCG #UE
schedule.gdconf.com/session/deve...
Developing Large Procedural Systems with Low Friction and Fast Generation (Presented by Epic Games) | Agenda | GDC Festival of Gaming
The GDC Festival of Gaming program blends expert insight with interactive formats designed to spark ideas, sharpen skills, and connect communities.
schedule.gdconf.com
January 24, 2026 at 6:28 PM
I'll be presenting with the awesome @highlyspammable.bsky.social
at the GDC26!! Come say hi :D
Developing Large Procedural Systems with Low Friction and Fast Generation (Presented by Epic Games) #GDC2026 #PCG #UE
schedule.gdconf.com/session/deve...
at the GDC26!! Come say hi :D
Developing Large Procedural Systems with Low Friction and Fast Generation (Presented by Epic Games) #GDC2026 #PCG #UE
schedule.gdconf.com/session/deve...
Super early birds get the worms. The discount worms 🪱
200 worms! Or I mean, they get to not have those worms. Uhm...
Anyway, cheap tickets! 😅
Super-early bird pricing at $200 off for Unreal Fest Chicago are now available: unrealengine.com/events/unreal-fest-chicago-2026
200 worms! Or I mean, they get to not have those worms. Uhm...
Anyway, cheap tickets! 😅
Super-early bird pricing at $200 off for Unreal Fest Chicago are now available: unrealengine.com/events/unreal-fest-chicago-2026
January 21, 2026 at 11:29 AM
Super early birds get the worms. The discount worms 🪱
200 worms! Or I mean, they get to not have those worms. Uhm...
Anyway, cheap tickets! 😅
Super-early bird pricing at $200 off for Unreal Fest Chicago are now available: unrealengine.com/events/unreal-fest-chicago-2026
200 worms! Or I mean, they get to not have those worms. Uhm...
Anyway, cheap tickets! 😅
Super-early bird pricing at $200 off for Unreal Fest Chicago are now available: unrealengine.com/events/unreal-fest-chicago-2026
The deadline for submitting talks for Unreal Fest Chicago is this Thursday, Jan 22nd! ⏱️
Unreal Fest 2026 is coming to Chicago next June, and I want YOU to present there!
Call for proposals is open until January 22nd, speakers get free hotel accommodation and conference tickets 🤘
Apply here: unrealengine.com/news/apply-to-present-at-unreal-fest-chicago-2026
I hope to see you there!
Call for proposals is open until January 22nd, speakers get free hotel accommodation and conference tickets 🤘
Apply here: unrealengine.com/news/apply-to-present-at-unreal-fest-chicago-2026
I hope to see you there!
January 20, 2026 at 1:02 PM
The deadline for submitting talks for Unreal Fest Chicago is this Thursday, Jan 22nd! ⏱️
Check out all the recent work that's been done to make async loading UObjects in the editor a reality. You can give it a try in 5.7:
dev.epicgames.com/community/le...
dev.epicgames.com/community/le...
Mastering Async Loading in Unreal Engine | Knowledge base
This tutorial explains how async loading works and how to best leverage it.
dev.epicgames.com
January 12, 2026 at 2:23 PM
Check out all the recent work that's been done to make async loading UObjects in the editor a reality. You can give it a try in 5.7:
dev.epicgames.com/community/le...
dev.epicgames.com/community/le...
Conferences can be super busy; it can be hard to find the time to eat dinner.
Fun fact: hors d'oeuvres can be a dinner if you just eat enough of them! 🤯
Pic related: me gobbling down finger food while the other person talks.
Fun fact: hors d'oeuvres can be a dinner if you just eat enough of them! 🤯
Pic related: me gobbling down finger food while the other person talks.
January 2, 2026 at 2:59 PM
Conferences can be super busy; it can be hard to find the time to eat dinner.
Fun fact: hors d'oeuvres can be a dinner if you just eat enough of them! 🤯
Pic related: me gobbling down finger food while the other person talks.
Fun fact: hors d'oeuvres can be a dinner if you just eat enough of them! 🤯
Pic related: me gobbling down finger food while the other person talks.
This guide complements The Great Hitch Hunt presentation really well, also check that out if you haven't already: dev.epicgames.com/community/le...
The Great Hitch Hunt: Tracking Down Every Frame Drop | Tutorial
Hear ye, developers! A scourge plagues our beloved industry. Grab your pitchforks and rally with Ari “the Hitch Hunter” Arnbjörnsson as he arms you with...
dev.epicgames.com
December 16, 2025 at 8:59 AM
This guide complements The Great Hitch Hunt presentation really well, also check that out if you haven't already: dev.epicgames.com/community/le...
My coworker Zhi Kang Shao just published the Level Streaming Hitching Guide, a huge resource on the things you can do to prevent hitches during level streaming.
Read it here: dev.epicgames.com/community/learning/tutorials/qpll/unreal-engine-level-streaming-hitching-guide
Read it here: dev.epicgames.com/community/learning/tutorials/qpll/unreal-engine-level-streaming-hitching-guide
Level Streaming Hitching Guide | Tutorial
Guide to recognizing common level streaming hitches in your Unreal Insights captures and tips and links to resources to address them. Hitches refers to ...
dev.epicgames.com
December 16, 2025 at 8:59 AM
My coworker Zhi Kang Shao just published the Level Streaming Hitching Guide, a huge resource on the things you can do to prevent hitches during level streaming.
Read it here: dev.epicgames.com/community/learning/tutorials/qpll/unreal-engine-level-streaming-hitching-guide
Read it here: dev.epicgames.com/community/learning/tutorials/qpll/unreal-engine-level-streaming-hitching-guide
Unreal Fest 2026 is coming to Chicago next June, and I want YOU to present there!
Call for proposals is open until January 22nd, speakers get free hotel accommodation and conference tickets 🤘
Apply here: unrealengine.com/news/apply-to-present-at-unreal-fest-chicago-2026
I hope to see you there!
Call for proposals is open until January 22nd, speakers get free hotel accommodation and conference tickets 🤘
Apply here: unrealengine.com/news/apply-to-present-at-unreal-fest-chicago-2026
I hope to see you there!
December 16, 2025 at 8:44 AM
Unreal Fest 2026 is coming to Chicago next June, and I want YOU to present there!
Call for proposals is open until January 22nd, speakers get free hotel accommodation and conference tickets 🤘
Apply here: unrealengine.com/news/apply-to-present-at-unreal-fest-chicago-2026
I hope to see you there!
Call for proposals is open until January 22nd, speakers get free hotel accommodation and conference tickets 🤘
Apply here: unrealengine.com/news/apply-to-present-at-unreal-fest-chicago-2026
I hope to see you there!
Reposted by Ari Arnbjörnsson
Another one for my #UnrealEngine required reading list: dev.epicgames.com/community/le...
Level Streaming Hitching Guide | Tutorial
Guide to recognizing common level streaming hitches in your Unreal Insights captures and tips and links to resources to address them. Hitches refers to ...
dev.epicgames.com
December 15, 2025 at 6:47 PM
Another one for my #UnrealEngine required reading list: dev.epicgames.com/community/le...
"Mafia: The Old Country: Using MetaHuman in a AAA Character Pipeline" is a fantastic talk on Hangar 13's use of MetaHuman for their amazing-looking characters! 🤩
Watch it here: youtube.com/watch?v=V8rL1r_1IcQ
Watch it here: youtube.com/watch?v=V8rL1r_1IcQ
December 15, 2025 at 12:13 PM
"Mafia: The Old Country: Using MetaHuman in a AAA Character Pipeline" is a fantastic talk on Hangar 13's use of MetaHuman for their amazing-looking characters! 🤩
Watch it here: youtube.com/watch?v=V8rL1r_1IcQ
Watch it here: youtube.com/watch?v=V8rL1r_1IcQ
Reposted by Ari Arnbjörnsson
Ari and I both said a lot of words on stage at #UnrealFest Stockholm, and I think these are the most important. How to think about profiling, how to read the unicorn barf that is Unreal Insights, and tips for looking at GPU captures.
How do we profile games at Epic Games? Check out this presentation where @mattoztalay.bsky.social and I examine perf captures from Arctic Hazard's "NORSE: Oath of Blood" and show you how to use Unreal Insights and PIX.
www.youtube.com/watch?v=C-Aj...
www.youtube.com/watch?v=C-Aj...
Profiling with Purpose: Performance Lessons from a Real Unreal Project | Unreal Fest Stockholm 2025
YouTube video by Unreal Engine
www.youtube.com
December 11, 2025 at 1:56 PM
Ari and I both said a lot of words on stage at #UnrealFest Stockholm, and I think these are the most important. How to think about profiling, how to read the unicorn barf that is Unreal Insights, and tips for looking at GPU captures.
Wow, perfect timing! I was just writing up some info on that internally for my teammates 😄
See image. The link goes here: dev.epicgames.com/documentatio...
See image. The link goes here: dev.epicgames.com/documentatio...
December 12, 2025 at 3:05 PM
Wow, perfect timing! I was just writing up some info on that internally for my teammates 😄
See image. The link goes here: dev.epicgames.com/documentatio...
See image. The link goes here: dev.epicgames.com/documentatio...
How do we profile games at Epic Games? Check out this presentation where @mattoztalay.bsky.social and I examine perf captures from Arctic Hazard's "NORSE: Oath of Blood" and show you how to use Unreal Insights and PIX.
www.youtube.com/watch?v=C-Aj...
www.youtube.com/watch?v=C-Aj...
Profiling with Purpose: Performance Lessons from a Real Unreal Project | Unreal Fest Stockholm 2025
YouTube video by Unreal Engine
www.youtube.com
December 11, 2025 at 12:30 PM
How do we profile games at Epic Games? Check out this presentation where @mattoztalay.bsky.social and I examine perf captures from Arctic Hazard's "NORSE: Oath of Blood" and show you how to use Unreal Insights and PIX.
www.youtube.com/watch?v=C-Aj...
www.youtube.com/watch?v=C-Aj...
Reposted by Ari Arnbjörnsson
Hæ from Reykjavík! Huge thanks to @flassari.bsky.social for being part of the very first Reykjavík Game Summit, and for capturing this great moment along the way! 📸
I got to be a part of history! Super grateful to be able to participate on stage at Reykjavík Game Summit's inaugural conference 🤩
"Hi from Reykjavík!" 👋
"Hi from Reykjavík!" 👋
December 5, 2025 at 9:59 PM
Hæ from Reykjavík! Huge thanks to @flassari.bsky.social for being part of the very first Reykjavík Game Summit, and for capturing this great moment along the way! 📸
Reposted by Ari Arnbjörnsson
I was lucky enough to be part of @flassari.bsky.social ’s excellent 101 Tips & Tricks at Unrealfest Stockholm, which is both useful and a really fun watch. At one point, I do wrestling promo voice :)
Now online, go check it out if you're an Unreal Engine gamedev!
youtu.be/4w0PWcRwyOc?...
Now online, go check it out if you're an Unreal Engine gamedev!
youtu.be/4w0PWcRwyOc?...
101 Unreal Engine Tips & Tricks: The Reckoning | Unreal Fest Stockholm 2025
YouTube video by Unreal Engine
youtu.be
December 4, 2025 at 9:55 PM
I was lucky enough to be part of @flassari.bsky.social ’s excellent 101 Tips & Tricks at Unrealfest Stockholm, which is both useful and a really fun watch. At one point, I do wrestling promo voice :)
Now online, go check it out if you're an Unreal Engine gamedev!
youtu.be/4w0PWcRwyOc?...
Now online, go check it out if you're an Unreal Engine gamedev!
youtu.be/4w0PWcRwyOc?...
There are no stupid questions!
That's basically what's already happening. They shouldn't get compiled every game start, they get cached by the GPU driver. UE still needs to send those requests to make sure every one of them is still cached, but it's much faster on subsequent runs.
That's basically what's already happening. They shouldn't get compiled every game start, they get cached by the GPU driver. UE still needs to send those requests to make sure every one of them is still cached, but it's much faster on subsequent runs.
December 5, 2025 at 12:57 PM
There are no stupid questions!
That's basically what's already happening. They shouldn't get compiled every game start, they get cached by the GPU driver. UE still needs to send those requests to make sure every one of them is still cached, but it's much faster on subsequent runs.
That's basically what's already happening. They shouldn't get compiled every game start, they get cached by the GPU driver. UE still needs to send those requests to make sure every one of them is still cached, but it's much faster on subsequent runs.
When an Unreal 5.3+ game runs, it will immediately kick off precompilation of global shaders. You should wait for that to complete before starting the game, otherwise you'll likely get hitches. You do that with the NumPrecompilingPSOsRemaining node. #uetips
December 4, 2025 at 12:01 PM
When an Unreal 5.3+ game runs, it will immediately kick off precompilation of global shaders. You should wait for that to complete before starting the game, otherwise you'll likely get hitches. You do that with the NumPrecompilingPSOsRemaining node. #uetips
I got to be a part of history! Super grateful to be able to participate on stage at Reykjavík Game Summit's inaugural conference 🤩
"Hi from Reykjavík!" 👋
"Hi from Reykjavík!" 👋
December 3, 2025 at 10:51 AM
I got to be a part of history! Super grateful to be able to participate on stage at Reykjavík Game Summit's inaugural conference 🤩
"Hi from Reykjavík!" 👋
"Hi from Reykjavík!" 👋
I've been waiting on this one! See how to use our new and immensely powerful GPU profiler in Unreal Engine 5.6+, and how it helps you debug GPU crashes! #uetips
www.youtube.com/watch?v=vnbA...
www.youtube.com/watch?v=vnbA...
New GPU Profiler and RHI Submission Pipeline | Unreal Fest Stockholm 2025
YouTube video by Unreal Engine
www.youtube.com
December 3, 2025 at 9:02 AM
I've been waiting on this one! See how to use our new and immensely powerful GPU profiler in Unreal Engine 5.6+, and how it helps you debug GPU crashes! #uetips
www.youtube.com/watch?v=vnbA...
www.youtube.com/watch?v=vnbA...
Reposted by Ari Arnbjörnsson
I was not able to make it to Unreal Fest Stockholm, but thanks to @flassari.bsky.social I still ended up on stage!
You can find me at 1:50:46 in the video, when I show the Unreal asset browser feature to rotate thumbnails of 3D assets.
You can find me at 1:50:46 in the video, when I show the Unreal asset browser feature to rotate thumbnails of 3D assets.
November 30, 2025 at 2:27 PM
I was not able to make it to Unreal Fest Stockholm, but thanks to @flassari.bsky.social I still ended up on stage!
You can find me at 1:50:46 in the video, when I show the Unreal asset browser feature to rotate thumbnails of 3D assets.
You can find me at 1:50:46 in the video, when I show the Unreal asset browser feature to rotate thumbnails of 3D assets.
We attempted to cram over 100 #uetips into a single presentation at Unreal Fest Stockholm. Did we succeed? Find our right here 👇
www.youtube.com/watch?v=4w0P...
www.youtube.com/watch?v=4w0P...
101 Unreal Engine Tips & Tricks: The Reckoning | Unreal Fest Stockholm 2025
YouTube video by Unreal Engine
www.youtube.com
November 30, 2025 at 9:43 AM
We attempted to cram over 100 #uetips into a single presentation at Unreal Fest Stockholm. Did we succeed? Find our right here 👇
www.youtube.com/watch?v=4w0P...
www.youtube.com/watch?v=4w0P...
We managed to fill the room at CCP Games for the Reykjavík Unreal Engine Evening, no wonder with those banger presentations 🤩
"Hi from Reykjavík!" 👋
"Hi from Reykjavík!" 👋
November 29, 2025 at 9:27 AM
We managed to fill the room at CCP Games for the Reykjavík Unreal Engine Evening, no wonder with those banger presentations 🤩
"Hi from Reykjavík!" 👋
"Hi from Reykjavík!" 👋
Did that Super Mario Galaxy movie trailer get your nostalgia running? Feel like getting it out of your system by creating something? Why not start with the Custom Gravity tutorial, it will make for a great base for tiny planet hopping!
🌍🏃♂️➡️🌏
dev.epicgames.com/community/le...
🌍🏃♂️➡️🌏
dev.epicgames.com/community/le...
November 14, 2025 at 3:29 PM
Did that Super Mario Galaxy movie trailer get your nostalgia running? Feel like getting it out of your system by creating something? Why not start with the Custom Gravity tutorial, it will make for a great base for tiny planet hopping!
🌍🏃♂️➡️🌏
dev.epicgames.com/community/le...
🌍🏃♂️➡️🌏
dev.epicgames.com/community/le...
UE 5.7 is out, featuring our new Megaplants plugin: procedural instanced nanite skeletal meshes that voxelize in the distance 👀
@williamfaucher.bsky.social just released a great "getting-started" tutorial on it:
www.youtube.com/watch?v=3f7m...
@williamfaucher.bsky.social just released a great "getting-started" tutorial on it:
www.youtube.com/watch?v=3f7m...
Unreal Engine 5.7 MEGAPLANTS Crash Course #ad
YouTube video by William Faucher
www.youtube.com
November 13, 2025 at 12:19 PM
UE 5.7 is out, featuring our new Megaplants plugin: procedural instanced nanite skeletal meshes that voxelize in the distance 👀
@williamfaucher.bsky.social just released a great "getting-started" tutorial on it:
www.youtube.com/watch?v=3f7m...
@williamfaucher.bsky.social just released a great "getting-started" tutorial on it:
www.youtube.com/watch?v=3f7m...