Cursor input lags

[BenCheung0422]

Type

Performance

Bug description

Sometimes when playing with my mouse cursor, the cursor may suddenly stop and continue its relative movements (without teleportation), or with slow movements for a certain span, varies from a few hundreds to a few seconds. From the recordings, comparing the properties between tablet pen (as in #27227) and mouse, it is possible that all of the cases mentioned are related to the drop/loss in input frames. This may be similar to #27488, but I am not sure.

For example, if there is a loss in input frame occurring for tablet pen, the next frame would be the new absolute position corresponding to the position of the pen cursor; if there is a loss in input frame occurring for mouse, the next frame would be the relative movement of the mouse cursor as the previous frame including the data of the cursor movement is lost. Please note that this is just my guess.

Furthermore, from the latest recording without stats overlay, no performance input is logged, which means no slow frames are detected, and no logs can be found around the time, even in the system logs. It is possible that the criteria for incidents might be hard to be spotted out.

The causes of this problem might not be related to GC (as in the two other videos attached with statistics overlay, but it is possible that the overlay causes the lags instead), and may possibly be located by profiler/debugger (possibly internal causes).

Screenshots or videos

Slow movements (for around a second)

2024-03-13.21-25-08.out.mp4

For the video above, I used 2880x1620 DSR for my 1920x1080 monitor recorded with OBS, so that I can put the 2 console windows (smaller) on top on the full-screen game window in output. The font size of the consoles is also changed from 12 (default) to 7 to render more text.

Slow movements (for around 2 seconds; recorded in 2024.302.1)

2024-03-11.23-00-00.out.mp4

Sudden stop (blue circles "1" to "2"; recorded in 2024.302.1)

2024-03-11.22-26-13.out.mp4

Version

2024.312.1

Logs

Logs from the latest recording above

logs-1710333379.zip

[EVAST9919]

ppy/osu-framework#6181

[frenzibyte]

ppy/osu-framework#6181

Not relevant apparently, see #27227 (comment).