Saving a document takes very long

I am working with LibreOffice on Windows 7.
When saving a document with a bit larger size (>100kB), LibreOffice freezes and shows “No reply” for several minutes (tried in writer and calc).
I have read, that it could be due to the virus scanner. I use Avira
This is very cumbersome!

Kannst Du auf eine neuere Version von LO 4.2.x updaten? Ich glaube in 4.1 gab es ein paar Probleme mit der Speicherung.