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PC slow after BIOS update/cleaning

HP Recommended
HP 280 G2 MT
Microsoft Windows 10 (64-bit)

I am facing a strange situation. The PC- a HP 280 G2 MT, suddenly got slow, especially while booting after a BIOS update. Along with that; this might be slightly off topic, but let me elaborate- I used a mobile cleaning solution/ sprayed a bit from outside of the CPU cabinet to get rid of the dusts. I thought that the solution might have got inside the PC and caused some damage. However even after the cleaning, I let it dry for half an hour, and in the old BIOS, there was no lag on the machine. However now it is quite bothering. A sfc scan found some problems and fixed those accordingly.
What could be the problem? The BIOS update or hardware damage? Please share your opinions.

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