Any ideas why Chateau LTE12 modem increases latency twice compared to old cat4 modem

Hello,

I am new here, sorry if I asked in the wrong place. Recently I bought this model. My setup is the default: just updated LTE firmware and RouterOS to 7.1.2, and a few DHCP options. Lucky, I was monitoring the network. Please ignore the spike, it happened during heavy download. You even could tell a moment I switched to Chateau. Speed increased twice as well, but for gaming, latency is more important. PC is connected via LAN, 1gbps connection:
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The LTE connection is not the greatest one. But the old chinese 4cat modem was in the exact same spot. If I remember correctly, the old modem was connected to the B7 band.
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