maximum number /interface bridge host ?

is there any maximum number for ?
/interface bridge hostx86 , RB7xx ?

i have a RB750 with more than 500 entries ?
/interface bridge
add admin-mac=00:0C:42:70:10:D2 ageing-time=5m arp=enabled auto-mac=yes
disabled=no forward-delay=15s l2mtu=1520 max-message-age=20s mtu=1500 name=
bridge1 priority=0x8000 protocol-mode=rstp transmit-hold-count=10any experience in customize for better performance ?