Why do you play CSOL cards one by one?
The second possibility: the memory is too small. Computers can't calculate quickly. It is recommended to buy 1G memory chips.
The third possibility: the space of drive C is too small and the computer runs slowly. It is suggested to delete some useless space-occupying things on disk C.
The fourth possibility: none of the above three, so it is recommended to use optimizer to clean up (system cleaning-disk file management) and delete the scanned junk files, and it is best to clean up the historical traces again.
Leaving the computer on for a long time will damage the computer and slow down, which will definitely affect the delay problem. I suggest that you turn off your computer every time you finish using it, so that the computer can have a rest.
A computer virus is unlikely, otherwise even CSOL can't be opened. If you are afraid, it is recommended to use anti-virus software to kill drive C.