hotspot cpu load

good nights, i have an rb433ah with hotspot enabled but when a 20 clients is logged then the cpu load gos to 80 - 90% load, and the web browsing goes to slow, is this issue normal? how many hotspot users can handle this board? the routerOs is 3.20, and have no other rules. thanks a lot

On the wireless card settings, do you use adaptive noise immunity, compression or WPA-PSK encryption? They can potentially use up your CPU time. If not, then about 20 clients seem to be the limit for your specific traffic load on your RB433AH.