Mesh setup - slow download speed

I have a mesh setup like below
Omada EAp245 (original firmware)->TPLink Archer C7 (Openwrt) -> TPLink Archer C5 (Openwrt). The Archer C7 has been connected as AP from EAP245 and mesh has been configured. The connectivity between C7 & C5 is good, but the client connected to C5, is having very slow download speed using speedtest (less than 1mbps) where as the upload is good around 40mbps. Anything needs to be tuned?

hi @vaidyasr, I've the very same problem. did you sort it out?