Hi @Cornflakes81,

There could be other environemntal factors that have degraded your overall wifi performance.  For example, I live in a densly populated area and I'm sure most of my neighbors set their wifi to max transmit power, auto channel and the largest channel width; my optimization effectivness is at the mercy of their channel auto selection.  Even if you're out in the midlle of nowhere, there could be people using hotspots or other electrolics that generate noise on the wifi bands.

Have a l look at this KB (https://community.tp-link.com/en/business/kb/detail/412744).  I think it essentially covers what to do to optimization wifi and is likely the logic used in the WAN Optimization process.