After reading this thread about Sigil 1.5.1. performance I would like to mention that for me these issues started with version 1.4.3.
I usually do a lot of find and replace and in that version performing searches in a regular epub with some normal size xhtml-files inside causes long delays during which the system is unresponsive. "Freezes" for 15 - 20 seconds are common. I have returned to 1.3.0. on which everything is fine and I do not have any slow downs working on the same files. On occasion I have a delay of 1 - 2 seconds when hits on search terms are far apart, but most of the time it is near instant.
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