draw is slow and flashs when saving

I’m using libre office since earliest version and it worked quick and better than openoffice. After the 4.x it started to be slower and with latest 5.x serial the saving is very slow. Currently I’m using the 5.4.1
I’m working on a Win7 professional 32bit 2GB Ram the problem is with any filsize. Also it flashes when saving, temporarily disappears and show another open program than back again to work.
I made a test installing latest openoffice 4.1.4 and with the same file it works fine, saving in 1/4 of the time without flashing or disappearing at all. I uninstalled openoffice just because the PDF exporting isn’t quite good and other poor extensions behavior.
Does anyone experienced my same problem in libreoffice of slow saving and hanging UI?