The very first time SiteLock scans a site, it will take some time to download the files from that site.
This may have a minor effect on the site’s performance, especially for larger sites. As the days go by, SiteLock will be downloading fewer files, because SiteLock is only pulling new and changed files to the server. This should reduce the impact SiteLock has on the server.
Daily online virus and malware scans are scheduled for midnight to minimise site performance issues. You can also set your own scan times and intervals.