MediaTek MT7621A CPU VS Qualcomm IPQ4019

Good afternoon, I am writing to you since I have a question. I have 2 devices with Openwrt Linksys ea7300 v1 (MediaTek MT7621A dual-core CPU at 880 MHz) and another Linksys MR6350 (Qualcomm IPQ4019 CPU with 4 Cores at 717 MHz), which I have a 100 megabytes connection of downloads and 100 megabytes of uploads, both in full work. It catches my attention that the Linksys EA7300 v1 consumes 200% and the MR6350 barely maxes out 70%.... I attach evidence.

Why is this because having the Mr6350 4 cores performs better???

EA 7300 V1

LINKSYS MR6350