What is the biggest performance bottleneck in Phaser (or any gfx lib)?

[GreatBigBore]

Is it just the computation, or is it mostly the I/O, like talking to the browser and waiting for it to push a bunch of pixel data to the hardware? I ask because I wonder if I could fast-forward my game (for a sort of time-travel effect) just by telling Phaser to stop drawing and keep time going forward, but a zillion times faster than the normal frame rate. But if the slow part is really just computing all the physics and stuff, I guess there's no way to fast-forward. Anyone know anything about the guts of graphics libs?

[ozdy]

Just try for yourself, physics performance depends greatly on number of objects ingame. Drawing still seems to be the bottleneck in my games (non web-gl).

[GreatBigBore]

47 minutes ago, ozdy said:

Just try for yourself, physics performance depends greatly on number of objects ingame. Drawing still seems to be the bottleneck in my games (non web-gl).

Not sure how to try for myself. Do you mean turning off the drawing to the canvas? That's what I was thinking of, but I don't know how to do it. Is it just an easy switch somewhere?

[s4m_ur4i]

So. You could make your game "the fastes forwarding" by normal speed. -> So you need the performance to be capable of. But that's your entrypoint: fastest speed. And to play the game at "average ingame speed" you can set 
game.time.slowMotion = 0.5;

https://phaser.io/examples/v2/time/slow-down-time

Not as smart as doing is programmatically but maybe a thought worth it?
For slow-motion you could even go slower and stuff - and with desiredFPS you can control your setup.

regards

[ForgeableSum]

game.time.slowMotion doesn't make things go faster, only slower. 

If you lower the desiredFPS, you will increase the speed of everything in the game. e.g. game.time.desiredFps = 30 will give you double the speed of 60 (the default). The drawback is that you're now looking at 30 FPS, which isn't as easy on the eyes as 60. 

[drhayes]

In the Phaser.Game constructor you can tell it to render HEADLESS. AFAIK that'll turn off the graphics render.