Using setfenv with carefully selected functions to expose (without reducing functionality so much that the types of add-ons are limited significantly) and preventing bytecode from being loaded by add-ons has worked pretty well for Vendetta Online , which is a MMOFPS that has had client side Lua add-...

If you use scissors, you might need to specify some setCanvas flags. Like the *boolean stencil (false)* on this page: https://love2d.org/wiki/love.graphics.setCanvas Much like the android port, this one is quite picky this things. FWIW, scissors don't need any special setup or setCanvas flags - the...

A shader is the only way. Modern GPUs support color component swizzles when creating a texture which would let you do that, but not all GPUs support it and love doesn't provide a way to use that capability at the moment. Here's an example of a basic shader: vec4 effect(vec4 vcolor, Image tex, vec2 t...

Ah, in that case I'd expect most of the performance drop to be caused by the specific effects you're using being rendered to screen_width * screen_height number of pixels pixels at least 20 times (a GPU bottleneck, and more than 20 times if the effects are doing more than one full-screen pass). Depe...

I'm currently on a Macbook Pro and even an empty application with vsync off and just the sleep the CPU is up to ~103% here is the love file for testing purpose. There was a bug in the version of OpenAL Soft shipped with the original love 11.3 download for macOS which caused increased CPU usage on a...

20 * 10000 is 200,000 individual calls to love.graphics.draw. Most of them will be batched together automatically by LÖVE (since only the color and transformation state change), but even so that's a lot of work being done each frame, with little purpose. Did you mean for your code to do that?

Garbage collection is local to individual threads / Lua instances, it's just the internal memory address space used by LuaJIT 2.0 that is shared (so in practice the only Lua thing shared is the memory cap).

What if I use love multithreading? Am I correct that every love thread creates separated Lua environment? LuaJIT's hard memory limit is per process rather than per Lua instance within a process unfortunately, so spreading memory across multiple threads won't raise the limit. That being said, most m...

Setting highdpi to true should work. If you use love.window.setMode you'll need to set it there as well.

For pixel truetype fonts, you may also want to use mono hinting (love.graphics.newFont(filename, size, "mono")).

File saving and loading should work fine on iOS. It uses the app's sandboxed Application Support directory.