I'm not opening HEIC files, I'm viewing the folder in Windows File Explorer.
For example I have 1,000 HEIC files in a folder and I'm doing a list view with a few tag columns like "Date Taken".
When scrolling the folder it stalls and takes forever. If I rename some files it takes minutes to display.
JPG or PNG files view pretty quickly.
Windows is the #1 OS and iPhones are the #1 phone with photos in HEIC format. Wish that Microsoft would have done a better job handling HEIC files especially since we still have to pay for the codec,