Decrease performances

Hello

Today, when I oppened Solidworks, i found it very slow...

And then, when I would to create a part, Solidworks had much lag, and he crashed.

I have restrated Solidworks and my computer many times, but it still don't work...

I don't known where the problem come from, because before it worked perfectly.

What can I do ?

I specify I'm using a student edition.

Sorry for my english, i'm french :-) .

SolidworksEducator Student