Non-100% Lobby Interface Scale reduced FPS until reset

[Porkch0p]

Overview:
When Lobby Interface Scale is set to 110%, the lobby is running at half the FPS of at 100% (90 vs 45 FPS). It happens when either scaling up or down.

If 'Lobby Interface Scale' is reset from 110% -> 100% -> 110%, the lobby is both scaled at 110% and running at no performance loss as long as the lobby stays running.

To Replicate:
You need a method to show FPS in the lobby. I used FRAPS. 'Expected' values show the result measured at 100% scale.

In Settings change 'Lobby Interface Scale' to 110.

Restart Zero-K

Expected FPS in Community, Chat, Friends, Settings, Downloads tabs [85,58,168,129,165]
Observed FPS in Community, Chat, Friends, Settings, Downloads tabs [46,25,163,112,153]

In Settings change 'Lobby Interface Scale' to 100.
Then change it back to 110.

Expected FPS in Community, Chat, Friends, Settings, Downloads tabs [85,58,168,129,165]
Observed FPS in Community, Chat, Friends, Settings, Downloads tabs [93,56,178,123,168]

Test Machine: Windows 7 64-bit , Core i5, Nvidia GTX 670

[Porkch0p]

CPU Usage Reduction following the above steps (4 cores, so 25% is a full core)

[Porkch0p]

This effect is also super unkind to lower-end graphics cards (FPS at top left)

[Licho1]

Wait a moment, is this the root cause? Its in widget:ViewResize which should not be called constantly.. was it causing loops?

[GoogleFrog]

Not loops, just an update each frame.