crs125-24g-1s-2hnd 100% cpu load when i am doing speedtest

In my case, i ma talking about uplink to upstream switch.
CRS device configured as switch without any routing or something else.
Is upstream limited to 200Mbps on Gigabit port?
Or i should configure some master port which will provide full speed?
Google showed post on this forum where CRS provides 1Gbps uplink with 60% load CPU