I've been getting <https://github.com/joreilly/chi...

# compose-web

[John O'Reilly]

I've been getting https://github.com/joreilly/chip-8 running in Wasm based Compose for Web....it runs pretty quickly in Compose for Desktop client but is very slow on Web....are there any particular options etc to optimise code (cc @bashor)?

[Oliver.O]

You could try this: https://kotlinlang.slack.com/archives/CDFP59223/p1689095346796049?thread_ts=1688638360.198979&amp;channel=CDFP59223&amp;message_ts=1689095346.796049

[John O'Reilly]

Thanks, will try that

[bashor]

According to runtime perf snapshots it doesn’t spend much CPU time. Have you tried to tune timing?

[John O'Reilly]

No, not yet

[John O'Reilly]

@bashor would you expect Compose for Desktop to be a lot faster than web right now?

[bashor]

Yeah, it may be faster. There is a big room for optimizations on the web

[John O'Reilly]

These ROMs ran on machines in the 70s so gessung there's something in the code that can be optimized 😃

[bashor]

I see it uses setTimeout (probably indirectly) which is limited in browsers for delays less ~5ms https://developer.mozilla.org/en-US/docs/Web/API/setTimeout#reasons_for_delays_longer_than_specified
Maybe that’s the reason that you are observing.

[John O'Reilly]

Away from laptop right now.... which code is using that?

[bashor]

I just looked on snapshots, there is no debug information so I don’t see names 🤷‍♂️

[bashor]

in the code I saw delay