Hello!
I have activated the web proxy on rb1200 and now the CPU is loaded up to 90-95%.
The numbers of user is about 200.
Please ,advice me how to resolve this issue.

P.S When i deactivate the web proxy , the CPU load is about of 25 %

Br.,
Andrei.

Without providing more information, it is very very hard to give any advice on what could be the issue or any potential fixes. Did you put in the necessary firewall filter rules to block it off from the internet? If not, it's not just your guests using the proxy, but other servers on the internet. It doesn't take long for bots on the internet to find open proxies and start to use them.

that's true.
find your solution with Firewall filter, mangle, Traffic Shaper, Load balancing, queue rule & Block your proxy for open network.