Just tried 5.3 and 5.3.1. When opening Styles & Formatting in Writes it takes around 15 seconds to open the options. But with 5.2.6 it only takes 4 seconds.
I have deleted (appcleaner) all the files related with LO (plist, etc…) and reinstall from scratch LO 5.3.1 and the results are the same (I made a mistake, there are not 10 seconds but 23 seconds to open Style of a text to be modified)
My conditions to work:
MacOSx Sierra 10.12.3, MacBook Pro TB
UPDATE-2: with new “fresh” version 5.3.3 it takes now 9 seconds, it has improved since 5.3.1, in front of 4 seconds that takes 5.2.7. I would like to test 5.3.3 but with such slowness it is not easy to work.