I want to use Mikrotik and Squid Proxy to cache web pages.

Mikrotik interfaces 3:
WAN: 201.xxx.xxx.xxx
LAN: 192.168.1.1
SQUID: 192.168.5.1

Squid Interfaces 1:
Link to Mikrotik : 192.168.5.2

I enabled in MK web proxy with option of parent proxy.
MK Ip->Firewall->NAT chain:srcnat, src-address:192.168.0.0/22, protocol:tcp, dstport:80, in-interface:LAN, action:redirect, to-port:3128
Mk IP->Firewall->NAT Chain:srcnat, src-address:192.168.0.0/22, out-interface: WAN, action:masquerade
Mk IP->Firewall->NAT Chain:srcnat, src-address:192.168.0.0/22, out-interface: WAN, action:masquerade

Is this correct?

The problem is the traffic to WAN is always more what the traffic to LAN