Unfortunately, not in this world, you're neither a smart feller, nor a fart smeller (Meme not made by Benson)
As for games best for Xbox speedruns, I'm not too deep into that community yet, but I do know that Breakdown and The Warriors are always looking for runners.
If you want to run the big stuff, then Battle for Bikini Bottom (BfBB) is a gigantic community.
I suppose there's also always Halo too
My suggestions, as a person who doesn't really understand all this stuff too well, but makes do with OBS on an alright win10 laptop.
For OBS itself, the big three performance changers are going to be resolution, FPS, and CPU profile.
-For resolution, I'll usually try to get as close to the source's resolution as possible. This makes recordings small and low cpu load, and you can resize them later by external programs. If you don't need to make any special modifications to the video, OpenShot is a free and easy choice.
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I try to get 60 FPS when I know it's a 60 FPS game, but sometimes you have to make do with 30. If you're uploading to Youtube, it automatically makes recordings be 30FPS at basically anything but the highest resolutions. Always try to match the FPS of the game regardless, anything higher than the source FPS is wasted.
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The CPU Profile is available under Settings/Output/Recording while in Advanced mode. The higher up on the list, the less the CPU OBS will try to use in recording. I've always heard to try and keep this around 30%, but sometimes I get encoding overloads unless I go lower. Experiment with this a lot to figure out what works best for each game.
(Also, Bitrate isn't really that big on changing performance in my experience. I'll usually leave it at default.)
For your computer itself, make sure you've got plenty of CPU open. Close anything extra you won't need during the run, and for web games, it'd probably be good to run in a browser that's very light on use. The big three are CPU hogs.
Also, Win10 uses, like, 4 GB of RAM by itself. It is pain, but we make do
The Advance is backwards-compatible, so that's probably it.
You're probably thinking of the GBA SP, which first used the folding two-screens design. The DS should only support GB and GBC through emulation, unless you've got some kinda magic DS or something
Composite is the most common analog video format. Usually what people mean when they say AV- the red, white, and yellow cables.
(Not to be confused with the similarly named Component, which is Red, Blue, Green cables, which is better, but far more expensive, often requiring adapters or specific video-out cables.)
And as a slight clarification, kinda on me, the DS only supports GBA specifically.
https://www.speedrun.com/kirbymeme
The only game you'll ever need.
But seriously, do check out the Advertisement thread: https://www.speedrun.com/speedrunning/thread/hl23s/1
Here you can find plenty of speedgames, all of them looking for more runners.
It'll be, as the kids say these days "way poggers"