The community feed is updated once per day. Therefore It doesn’t make sense to run the sync scripts more often. As far as I know one connection per IP address is allowed. A second connection will be blocked until the first connection has been closed.
Take attention to crontab. with the packages Openvas on CentOS, /etc/cron.d/openvas-sync-nvt and /etc/cron.d/openvas-sync-scap are run at the same hour (1h00). My updates have been blocked.
Change a time in one script (and remender to check/redo after yum update…).
If both scripts are running at the same time i would suggest to contact the maintainer of your used packages to get a short delay between both scripts added.