A company must buy a license, for personal use it is free. That is the only difference between the paid/free version.
I have never noticed any slowdowns. If needed the calculation of the MD5-hash of processes can be disabled in the settings (config.ini: "ComputeMD5Hash"). It will write "several MB" per day [logfile: ...\Logs\month.day.year.log] to the hard disk/SSD.
@novirusthanks Suggestion: Adding of additional hash types for calculating of hashes. For example: Code: ComputeMD5Hash=n ComputeSHA1Hash=n ComputeSHA256Hash=y Now, after switching ComputeSHA256Hash to "y", SHA256 hashes are calculated.