Fail to use fastjson in springboot of 2.2.6

When I use spring boot of version 2.2.6, I also use spring boot starter data redis.At this time,using fastjson does not work.Even if fastjsonhttpmessageconverter is configured.So,I remove Jackson.
There is another problem.When using redisTemplate, the efficiency is very low when the project is first started to take data from redis.After the first time,the efficiency is obviously accelerated,about several hundred times.Is there any optimization scheme?

For my integration solution, please go to https://blog.csdn.net/zhangpan_soft/articl...

Please help me see if there is any problem.