Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. downstream tidb cluster includes 3 tikv , every one is 8c32g and nvme disk
2. br restore point

2. What did you expect to see? (Required)

1. restore successfully
2. restore log speed can reach 30GB/H per tikv

3. What did you see instead (Required)

1. restore successfully
2. restore log speed is 8.14 GB/H per tikv

[2022/09/28 00:29:36.286 +00:00] [INFO] [collector.go:69] ["restore log success summary"] [total-take=12h12m43.357650708s] 
[restore-from=436220682829824000] [restore-to=436279881427582986] [restore-from="2022-09-24 20:04:06 +0000"] 
[restore-to="2022-09-27 10:47:50.729 +0000"] [total-kv-count=2064569816] [total-size=305.6GB] [average-speed=6.951MB/s]

4. What is your TiDB version? (Required)

v6.3.0