Will people on Windows and Linux please try Selenia's test case and see if you can recreate the timing issue?
I just can not with macOS. It works the same on Sigil-1.3.0, 1.4.3, 1.5.1 and master. It never takes even a second to load and display Chapter 12 of that epub and Searching is just as fast as well.
Please let me know just in case this problem seems to be specific to Windows.
|