My compose app renders around 100 composables on t...

# compose-desktop

[Xad Kile]

My compose app renders around 100 composables on the screen at the same time. I notice that it is very slow/laggy when it starts. Any action takes around 0.5-1 seconds to complete, but if I leave it alone for about 1-2 minutes, it somehow "stabilizes" and becomes very smooth. Is there anything I can do to fix this? I am testing on a low spec PC - CPU i5-4th gen, 8GB of RAM

[rnett]

I'd hazard a guess that this is due to the JVM's JIT having time to work. I don't know if Graal works with Compose, but that's generally the next step I'd take here

[Xad Kile]

@rnett Thanks, I'll try that 😁

[darkmoon_uk]

i5 with 8GB is low spec? I'm old...

[Xad Kile]

@darkmoon_uk the machine is 10 years old

[darkmoon_uk]

...yeah... I'm gonna refer you to my previous comment 😄

[mikehearn]

It'd be odd if it was JIT related. It could be but other GUI toolkits don't have that issue.

[mikehearn]

With "only" 8GB of RAM it's more likely to be swapping

[mikehearn]

If you quit the app and immediately restart it, do you still see the lag?

[Xad Kile]

@mikehearn I think this problem is caused by the PC itself, not compose. I just re-tested it, and everything is ok. One thing I notice is that the pc was quite hot yesterday, and I was running 3 instances of Idea, and many chrome tabs at the same time.

[mikehearn]

3 instances of IDEA would make a machine with much more RAM struggle. For sure you were under severe memory pressure and the delays were as the OS swapped the other stuff out.

[Xad Kile]

@mikehearn Yes, thank you Mike :D