I use loadrunner, and although get the conclusion:1.2.0 is slower than 1.1.12 I observe connect timeout error in loadrunner console, but I didn't see such error in 1.1.12.

For 1.2.0 , the rps line dive to very lower every 15-20 seconds, I think it because connect to nginx timeout .

I test 1.1.17 , the result is almost the same as 1.1.12. I then test 1.1.19 , the result is like 1.2.0,

So what happened between 1.1.17 and 1.1.19 will result the connection timeout every 15-20 seconds?