Windows 11 sandbox

does anybody have problem with transfer speed between local c drive and sandbox? i have nvme drives seems like speed dropped a while ago if i tranfer a 4-8 gig file takes like 8mims or more .i know it used to be faster than that. i have all current updates. maybe thats the problem. any body know how to fix?
thanks

The slow data transfer also can be hardware or computer issues. You might be able to fix this simply by disabling certain antivirus or cleaning up temporary cache files.

It's on a dell xps 17 turned off mcfee and deleted temp files .I remember microsoft saying one of there updated caused this but I assume they fixed with some new update.which I am current on so still not sure why

Just for fun I tried tranfering same 4 gig file to my drive d nvme it was done in a blink of and eye.so something is funny