Improved the overall performance more than 20% under heavyload
with little latency impact
heavy load
```
Requests/sec: ~23200 vs Requests/sec: ~31500
Latency distribution:
10% in 0.0883 secs.
25% in 0.1022 secs.
50% in 0.1207 secs.
75% in 0.1460 secs.
90% in 0.1647 secs.
95% in 0.1783 secs.
99% in 0.2223 secs.
vs
Latency distribution:
10% in 0.1119 secs.
25% in 0.1272 secs.
50% in 0.1469 secs.
75% in 0.1626 secs.
90% in 0.1765 secs.
95% in 0.1863 secs.
99% in 0.2276 secs.
```
Similar on light load too.
e4f22cd6d8