with that spec you shouldn’t experience a significant or even noticeable slowdown. Other users with less powerful pcs are happily using mtf without any problems, in fact before each release I test the software on a pc with a T3000 Intel Celeron processor and 2 GB RAM and it works fine there.
I suspect it will be something local but to say if it is the terminal, windows or a third app is only possible after some investigation.
Is it happening with all Symbols?
Is it happening with all brokers in different terminals?
Do you have an antivirus on a very strict setting running? The MTF functionality involves moving files and something might be capturing them.
If this doesn’t help I can have a look tonight around 9pm UK time using remote access.