I have got SecureAPlus on my Desktop with 3.2 ghz Processor and I don't feel any slow down but I tried it once on my Laptop once about 3 months ago and I felt a HUGE slowdown. Thanks for reply!I find Voodoo Shield light on my system. Crystal Security may be even lighter but VS protection is better with lightness. And VS have few protection modes so you can choose the suitable one.
If I had a personal system I would go for either Windows Defender + VS or may be VS alone.
SecureAPlus will definitely be heavier compared to other 2. I have tried VS & CS & both were light here. Never tried SecureAPlus.