This bug used to exist years ago, annoyingly it seems to be back. Toggling Duplicate Frame Markers will fix, but not ideal if you are rellying on the Duplicate Frame Markers function! After testing, it actually seems to be audio on the timeline that causes the lag, specificaly, if you have audio clips with several channels of sound this is enought to trip it. Mutlichannel WAVs, often trigger this bug, even though these are what are used by profesional sound recordists. Try deleting all your sound and keep on Duplicate Frame Markers, the lag should go. Absolutley not a helpful work around, but hopefully devs can use this info to target the bug!
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