The engine that keeps almost everything locally but somehow is still light is ESET. The likes of Kaspersky, Microsoft Defender, Avast keep a lot in the cloud to manage the size of their local engine. The size of their engine is huge and Bitdefender likes to keep all signatures locally. I think Bitdefender needs to do something about their engine. The update process hampers performance while it updates on a HDD machine. So this may not good in the long run for the health of your SSD. So this ends up writing too much data on your disk regularly. It's writes around 800 Mb data every time it receives a signature update. What I don't like about it at the moment is, it's I/O writes bytes is extremely high. Its web protection & behavioral protection are still very good though.

They are often very late at adding signature which Microsoft Defender, Kaspersky, ESET usually detects without any problem.

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