Ari Arnbjörnsson's Avatar

Ari Arnbjörnsson

@flassari

Senior Software Engineer, Developer Relations at Epic Games. Former Lead Programmer on #Returnal for #PS5 @Housemarque. https://ari.games for my presentations!

1,665
Followers
134
Following
198
Posts
22.10.2024
Joined
Posts Following

Latest posts by Ari Arnbjörnsson @flassari

Post image

When Unity started collapsing I made a quick "how do I get going in Unreal" website many folks found helpful. that website has now MOVED and is a DIFFERENT COLOUR. If you want Unreal demystification, tips and scoops, this is a place

www.ughiguessiwanttomovefromunitytounreal.com

07.03.2026 00:49 👍 200 🔁 76 💬 4 📌 1
Post image

Haha I'd say you get to choose your pick of the litter

02.03.2026 12:09 👍 2 🔁 0 💬 0 📌 0
Post image

Oldest logo is best!

02.03.2026 12:02 👍 3 🔁 0 💬 1 📌 0

It's also good to remember that you don't have to include the logo in your game, you should actually ask us permission first:
bsky.app/profile/flas...

02.03.2026 09:53 👍 3 🔁 0 💬 1 📌 0
Post image

I keep seeing people using the old UE logo to advertise their game/product. We updated it quite a while ago (the U is rounder now.)
You can just download the high-res logo from unrealengine.com/branding, don't get it from Google Images 😬

02.03.2026 09:48 👍 8 🔁 0 💬 2 📌 0
In-Engine · Double Fine's Keeper - Unreal 5 Exploration
In-Engine · Double Fine's Keeper - Unreal 5 Exploration YouTube video by Double Fine

Awesome video where @doublefine.com show you their in-engine Unreal workflows 😍 #uetips

www.youtube.com/watch?v=VMa5...

26.02.2026 09:29 👍 5 🔁 0 💬 0 📌 0
Video thumbnail

That's how you get zero stutters in your game. You're welcome, game industry. #uetips

18.02.2026 13:27 👍 21 🔁 7 💬 1 📌 1
Preview
Profiling with Purpose: Performance Lessons from a Real Unreal Project | Tutorial How does Epic Games’ Technical Developer Relations team profile games? Watch this session recorded at Unreal Fest Stockholm and learn our optimization...

The text version of "Profiling with Purpose: Performance Lessons from a Real Unreal Project" is up! Check it if you, like me, prefer text/images over videos for learning. #uetips

dev.epicgames.com/community/le...

18.02.2026 12:37 👍 28 🔁 5 💬 1 📌 1
The Technical Journey of Clair Obscur: Expedition 33 | Unreal Fest Stockholm 2025
The Technical Journey of Clair Obscur: Expedition 33 | Unreal Fest Stockholm 2025 YouTube video by Unreal Engine

"Clair Obscur was 95% Blueprints"

I've been eagerly waiting for this talk to be uploaded, great job Tom and team 💪

youtu.be/t1CrbTx6O6w?...

14.02.2026 10:32 👍 35 🔁 7 💬 0 📌 1
Oops
Oops

I gave a talk on Slate in Unreal Engine as part of JetBrains GameDev Day, and the individual video is now up!
https://www.youtube.com/watch?v=1n3oIfI7nBM
#UnrealEngine

14.02.2026 10:25 👍 16 🔁 4 💬 0 📌 0
Preview
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.

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...

24.01.2026 18:28 👍 7 🔁 3 💬 0 📌 0
Video thumbnail

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

21.01.2026 11:29 👍 2 🔁 0 💬 0 📌 0

The deadline for submitting talks for Unreal Fest Chicago is this Thursday, Jan 22nd! ⏱️

20.01.2026 13:02 👍 5 🔁 1 💬 0 📌 0
Preview
Mastering Async Loading in Unreal Engine | Knowledge base This tutorial explains how async loading works and how to best leverage it.

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...

12.01.2026 14:23 👍 20 🔁 2 💬 0 📌 0
Post image

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.

02.01.2026 14:59 👍 5 🔁 0 💬 0 📌 0
Preview
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...

This guide complements The Great Hitch Hunt presentation really well, also check that out if you haven't already: dev.epicgames.com/community/le...

16.12.2025 08:58 👍 1 🔁 0 💬 0 📌 0
Preview
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 ...

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

16.12.2025 08:58 👍 7 🔁 2 💬 1 📌 0
Post image

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!

16.12.2025 08:44 👍 1 🔁 0 💬 0 📌 1
Preview
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 ...

Another one for my #UnrealEngine required reading list: dev.epicgames.com/community/le...

15.12.2025 18:47 👍 8 🔁 3 💬 0 📌 0

Oh god 😅

15.12.2025 12:19 👍 1 🔁 0 💬 1 📌 0
Video thumbnail

"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

15.12.2025 12:13 👍 4 🔁 0 💬 0 📌 0

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.

11.12.2025 13:56 👍 12 🔁 6 💬 2 📌 0
Post image

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...

12.12.2025 15:05 👍 3 🔁 0 💬 1 📌 0
Profiling with Purpose: Performance Lessons from a Real Unreal Project | Unreal Fest Stockholm 2025
Profiling with Purpose: Performance Lessons from a Real Unreal Project | Unreal Fest Stockholm 2025 YouTube video by Unreal Engine

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...

11.12.2025 12:30 👍 18 🔁 2 💬 0 📌 1

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! 📸

05.12.2025 21:59 👍 5 🔁 2 💬 0 📌 0

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.

05.12.2025 12:57 👍 1 🔁 0 💬 1 📌 0
Post image

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

04.12.2025 12:01 👍 69 🔁 7 💬 1 📌 0
Video thumbnail

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!" 👋

03.12.2025 10:51 👍 4 🔁 0 💬 0 📌 1
New GPU Profiler and RHI Submission Pipeline | Unreal Fest Stockholm 2025
New GPU Profiler and RHI Submission Pipeline | Unreal Fest Stockholm 2025 YouTube video by Unreal Engine

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...

03.12.2025 09:02 👍 13 🔁 2 💬 1 📌 0