Slow site after move to new server

I have found the logs folder. There are lots of access_log and ftp_log files in it but nothing PHP related. Does that mean that there are no PHP errors?

I deleted all of the files in the thumbs folder and then re-uploaded some images to test it. Images are being written to the thumbs folder. I actually deleted all of the image files on the site and re-uploaded them. This sames to make the pages load faster.

I have been experimenting with switching PHP versions in the .htaccess file. Using AddHandler php54-cgi .php seems to work the best (but still does not seem 100% stable to me). Any of the other versions I try (5.5, 5.6, 7.0) make the panel really sluggish. This would confirm that it’s the PHP version, right? I am using the Privat Plus package at All-Inkl.com. I originally had this site installed using their normal Privat package and had no problems with the site. It was only after the upgrade to Privat Plus (which requires a server change) that I started seeing the problems. Would it help if I shared my URL?

Thanks,
Kurt