This is something I've wanted to report for a year or so now. As the title says, every time there's a cumulative Windows 10 update, the whole process is significantly slowed down -- Both the download and installation. It can literally take hours to finish with the whole system coming to a crawl.
It's bad enough that Windows updates are painfully slow at the best of times. BD (Virus Shield) just adds to the misery by using up significant system resources (CPU , Memory & Disk usage). This is even after considering that I'm on an aging hardware. The only recourse is to temporarily disable BD shield in the client.
Also, my limited system spec precludes me from performing full system scans. It can take up to 20 hours (what used to take 2 hours max) or more when the laptop's left untouched. I can forgo full scans considering I've been forced to downgrade to just 4GB RAM. It's the constant 100% disk usage that renders the system unusable.
Hoping, at least the Windows update issue gets looked into.
My specs:
Windows 10 20H2
BD Total Security 2021