Created attachment 144652 [details]
Archive containing video showing example of buggy behavior, 2nd video showing equivalent better behavior on windows 7

SUMMARY
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Item highlighting when hovering over differents menu items works poorly, easy to see for example when moving mouse in diagonal direction across different menu items. See attachment for example.
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STEPS TO REPRODUCE
1. Open application launcher (default one that gets opened if you press button in bottom left corner of the screen in default KDE Neon plasma layout)
2. Move mouse over main categories (tools, multimedia, system etc.) in various different patterns and see that highlighting of item currently under mouse cursor is not very responsive

OBSERVED RESULT
Menu item currently under mouse cursor is not highlighted in some cases, even after waiting infinitely.

EXPECTED RESULT
Menu item to be always highlighted instantly when going within its bounds.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
2nd video in attachments shows similar menu in windows 7 and its more robust behavior.
Bug found in vmware virtual machine under windows host, my mouse has high polling rate.