Lag when dragging UI elements around in debug builds

[nyanpasu64]

Git: master b3316d7
OS: Windows 10 x64

When I run a debug build of rawrscope, then drag a UI element (nested subwindow), it lags behind the cursor. The longer I keep dragging, the further the subwindow falls behind. During the process, rawrscope only eats around half a core of CPU (due to GPU sync?) and other UI elements don't respond. This does not occur in release mode.

Is this an imgui issue? Does it occur on slower computers or just in debug mode? Not sure how relevant this is.

Recording at https://youtu.be/vqDJuCj_Q7E

[rastertail]

This one is interesting, since the only difference between debug and release with my configuration is enabling LTO in release mode, optimization is enabled for debug too. This probably has something to do with the weird tricks I pull off to try and avoid input latency with imgui, but its all pretty cursed and I plan to revisit it soon.