clamscan and cpulimit together runs multiple clamscan processes in ubuntu 18 and 20

I have installed clamav and cpulimit. I want to clamscan all directories in /home which are not owned by root 1 by 1 with a cpu limit of 70%. I use the below command to do that in centos and almalinux: **find /home/ -mindepth 1 -maxdepth 1 -type d ! -user root -exec cpulimit -l 70 -- /usr/bin/clamscan -i -r {} ; > /root/scan_results.txt** The above command works fine in centos. But in ubuntu 18 and 20, it creates multiple clamscan processes for each directory which are in /home and all the processes consume 70% cpu usage thereby overloading my server. I checked that using 'top' command. 'ps aux | grep clamscan' command also shows multiple clamscan processes running simultaneously. **find /home/ -mindepth 1 -maxdepth 1 -type d ! -user root -exec /usr/bin/clamscan -i -r {} ; > /root/scan_results.txt** When I remove cpulimit from the command like shown above, it scans 1 by 1 but clamscan process consumes 100% cpu usage which I dont want. I tried some other commands which didnt work as well: 1) **find /home/ -mindepth 1 -maxdepth 1 -type d ! -user root | xargs -I {} cpulimit -l 70 -- /usr/bin/clamscan -i -r {} > /root/scan_results.txt** 2) **find /home/ -mindepth 1 -maxdepth 1 -type d ! -user root | xargs -P 1 -I {} cpulimit -l 70 -- /usr/bin/clamscan -i -r {} > /root/scan_results.txt** I want a command which scans all the /home directories which are not owned by root one at a time with cpulimit of 50% and not simultaneously.