Hello i have 2 NetMetal 5 AC ( 921UAGS-5SHPacT ) on both Side i have routeros version 6.18 after upgradin to routeros 6.29 in TCP test in only 100 Mbps with version 6.18 traffic was more better than 6.29 can anyone help me thank you .

Can you please describe in little more detail your test method ? Also copy your link status output with command:
/interface ethernet monitor [f]

name: ether1
status: link-ok
auto-negotiation: done
rate: 1Gbps
full-duplex: yes
tx-flow-control: no
rx-flow-control: no
advertising: 10M-half,10M-full,100M-half,100M-full,1000M-half, 1000M-full
link-partner-advertising: 10M-half,10M-full,100M-half,100M-full,1000M-full

i think the problem is not in ethernet you think it was rate : 100Mbps

Can you describe in little more detail how did You get those speeds ? So we could try to reproduce this.

here is CPE

how you generated tcp traffic. Then and now?

then was 160-170 Mbps

Because if you are using our Btest on device itself then you are only loading own cpu.
try to use iperf or different traffic generating on both ends of radio link pass traffic trough router.

no i am testing from Station to AP i am not testing itself
see picture above

The question is: what tool are you using and on which device is it running?