Hi.
I downloaded the ISO for beta build 22000.194 from MS insider page.
The downloaded ISO has a block in its properties window.
When I tried to mount the ISO, it mounted without any lag even if it had the block.
So something must have changed.
If anyone is still facing a lag when mounting the ISO, then unblocking the file is the solution.
Hi suat.cini,
That is quite normal when downloading from the Web, even if it is from a MS official insider site.