The pd leader occupies a large amount of cpu
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type/bug
- Dominant language
- Go
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Description
## Bug Report
use tikv-client get region info from pd server, GetRegion QPS 66k, leader CPU 3600%, Goroutine count 244k
### What did you do?
pressure test on online tikv culster
### What did you expect to see?
Load balancing and low resource usage
### What did you see instead?
GetRegion QPS 66k, leader CPU 3600%, Goroutine count 244k
### What version of PD are you using (`pd-server -V`)?
pd-server v8.1.0，tikv-client v2.0.7
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