Poor performance of openwrt in the c7 v5 porter

I recently bought a new tp archer c7 v5 router. I installed openwrt through tftp and doing speed tests I get bad results. I have asymmetric internet of 60mbps download and 6mbps upload and I get 60 upload and 1mb upload in openwrt

If it's connecting to the lan at 100Mbps, check for a duplex mismatch.