Hello MacPro early 2008 here, running Mac OS X Lion, Mavericks, Yosemite, El Capitan too.
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All versions of OS X on this machine run quick and smooth, so no problems here.
El Capitan is the last version of OS X that is compatible with the old slugger. World of tanks client for mac catalina.
Mac Os X Iso
So we need to find out what might be causing the slow performance on your Mac Pro.
Mac Os X Version History
You can download this, https://etrecheck.com/ run the app and copy and paste the results here.
Things that might be impeding your macs performance are lack of hard drive space, lack of RAM, although you seem fine at 12GBs, anti virus software, cleaning or optimisation software, incompatible apps, adware/malware, too many apps opening at login/startup. If you post the results of the etrecheck report we can have look and give you some pointers.
Mac Os X Versions
Apr 3, 2017 11:48 PM