One of the most often fixes for those kind of problems, is clearing your cache (use Game Doctor on Mini Client, if you use that instead).
Closing some programs that run in the background to free a bit of your RAM may help too.
If the mentioned solutions won't help, let me know, we will try to figure something out :)
Have a nice day
Just so you know clearing everything will make the client download everything from the scratch that's why his client become slower after your advise. Clearing cache is not the solution here TBH, your client is running slow a month ago. Lots of players are complaining but you give us nothing but that generic reply of clear your cache and insufficient RAM. Please find a better way.