Looking for reduce sync time working with calendar table

Hello! I would like tips to reduce sync time. I have a table of schedules that I try to link with the events of a calendar table to determine office occupancy.
I managed to solve it with SELECT(Offices [Name], AND (([Start] <= [_ THISROW]. [Start]), ([End]> = [_ THISROW]. [End]))) but the reality is that increase sync time too much.
I keep searching and looking at suggested options but so far I am not getting any options that will reduce sync time.
Thank you for reading!

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