Improve flicker/lag when UI first appears

[olilarkin]

Since enabling transient IGraphics contexts ( so that no textures et cetera are loaded onto the GPU until plug-in user interface is required), there is a noticeable lag seeing the UI, at least with virtualCZ. this wasn't an issue when the metal context was created before the UI was needed

[johannesmenzel]

Is this issue still relevant? I see a very noticeable lag of >5 seconds everytime I open the GUI on windows vst2 and vst3. Couldn't figure out by now if it's a problem of my custom controls, but my impression is that it got worse since around the "remove *this delegate" commit.

[olilarkin]

5 Seconds seems way more serious than anything I've seen. Are you using Nanovg (the default) on windows? there are some problems with that at the moment with multiple windows open it could be related

[johannesmenzel]

Yes, using NanoVG. When back on the code I'll try some things to figure out if it's a problem with my controls. But as far as I remember I had these issues from the beginning (means from duplicated IPlugEffect).

[johannesmenzel]

The severe lag of multiple seconds seems to be related to user specific errors (me) in my custom IControls.