1200 mangle rules, 300 simple queues

Hi,
If I had for example 1 mangle rule to ‘mark-connection’ and another to ‘mark-packet’ in both IPv4 and IPv6 firewall (giving the same packet-mark in each), and a simple-queue set up to rate limit that packet-mark, and then did that for every one of my 300 users: does anyone how a CCR1009 will handle it?