Windows 10: Icons on desktop

I think I know what is to blame for the initial slow(ish) display of desktop icons. And also some folders gradually displaying the .exe icons (mainly my downloads folder which has quite a few .exe files in it of varying degrees and sizes). It's Windows Defender. When I open the downloads folder I see a surge of cpu activity at about 15% whilst the exe icons generate. I opened task manager and saw the antimalware service executable was running at this percentage and then reduced to zero once when all the icons finished. So it seems this is the culprit and no amount of diddling with Maxed Icon Cache or rebuilding it will make a difference. That explains why after boot subsequent browses to the downloads folder are instant because Defender is happy with it. I guess it's doing what it should be doing but it's a tad annoying. I could try another service but I preferred Defender as it's integrated and in my mind of all the suites one could choose from Defender should play nicest with Windows (after all it's another MS product). Whilst not satisfied with the outcome it's nice to know why.

EDIT

Yep it's Defender confirmed, I rebooted. Disabled Defender real time scanning and opened my downloads folder. Every icon populated in a micro second. Obviously will switch it back on. Question is whether this should be considered a bug or intended behaviour!

Cheers,
Wayne

 

Simple google will give to this:
Decimal to Hexadecimal Converter

Interesting. However, if it's defender that causes the problem then you would hear a lot of complaints.

Turn the WD back on and try this link:
Startup Delay Time - Reduce in Windows 8
It's in 8 forum but is the same for Windows 10.

 

Nice registry tweak, I wondered why my 8 gadget pack was always a few secs delayed in starting. Now its more or less instant. Much better. Unfortunately it made no diff to the icons displaying. I'll have to ponder if worth living with or replacing Windows Defender

It's not widespread issue looking at google but it has been raised by someone else here:
W10 Windows defender still slow my exe icons from real-time - Microsoft Community

Thanks