perf: disable vsync by default

[scarf005]

Purpose of change

(the section with red arrow indicates time taken to render spinner UI)

• kind of solves Drawing time related performance regression #251

for more than 7 years SDL was initalized with SDL_RENDERER_PRESENTVSYNC. With vsync, the game must synchronize with monitor's refresh rate (60hz ~= 16.7ms), causing slowdown. Disabling VSync may improve performance.

Describe the solution

added disabled-by-default option Use Vsync (VSYNC) to control vsync behavior on GPU rendering.

Describe alternatives you've considered

keep using vsync

Testing

with vsync	without vsync

with vsync	without vsync

2024-03-31_20-23-14.mp4

Additional context

GPUs hate him! make your fps higher using this one weird trick

• found while measuring render performance using tracy from build: tracy integration #3253.
• related discord thread
• tracy history file with both vsync off and on: vsync-tracy.zip