Description:
Not really a bug (I think) but performance degradation that makes 5.3.6 unusable for me:

I have a large Calc file for music files (over 23000 lines) and scrolling became impossibly slow with 5.3.6 - such that it was all but impossible to find a specific line. Also text copied from an email into a Writer document, visible on screen, did not print and when I went to check printer settings LibreOffice crashed and crashed again on restart, losing the document. I have had to downgrade (to 5.2.7.2) and immediately I can use the big Calc file again. I have a laptop with a dual core i3 processor - not the fastest around but adequate for everything else I do including live streaming of concerts etc. It runs Windows 10 64 bit. You seem to have made 5.3.6 unnecessarily heavy.

Steps to Reproduce:
1. Load 5.3.6 on my computer.
2.
3.

Actual Results:  
described above

Expected Results:
Large Calc files become impossibly slow to scroll to nearly unusable.


Reproducible: Always

User Profile Reset: No

Additional Info:


User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36 OPR/47.0.2631.80