FPS lag issues

Hi,

I have a very weird problem here, let me explain:

I run a main client 64 bit which i play myself, usually along several other 32 bit clients. I recently took a 2 week break and just came back to wow.

Now the problem is:

If i run 1 64bit client and 1 32 bit client my 32 bit client is experiencing very high fps drops.
If i run 2 x 32 bit clients this problem disappears
If i run 2 x 64 bit clients this probem is not here either

my botting wow client is installed in seperate folder.

So i took following steps

i tried to log all the above from diff setup folders to make sure it has nothing to do with errors in files.

Also i have to mention no bot was attached to any of these clients during these tests.

Nothing has changed on my pc configuration and i was usually able to run 1 64 bit client along with 8 32 bit clients without experiencing any lag what so ever. (approx 2 weeks ago)

I have been googling maybe bliz changed something in recent patch but haven't found anything.

Does anyone has a clue what is going on?

Many thanks

 

*solved