Older version of MySQL server are faster than newer Versions

[Miran Nadir]

I thought that I must state the experiment which I did Yesterday:
I have used one machine which I have to do the test, every time I installed a different MySQL server version on it, configured them the same way then tried to restore a mysqldump file of a database which is around 20MB, take in mind that after each test, I removed the MySQL server version that I tested and then installed the other version and did the test again. below are the execution times which I got for each MySQL versions that I tested: Can anyone explain the drop in performance, why the older version are performing much faster?

mysql 8.0.24 et=2m.11sec

mysql 5.7.33 et=1m.05sec

mysql 5.6.51 1et=0m.34sec 2et=0m.46sec 3et=0m.55sec

mysql 5.5.62 1et=0m.14sec 2et=0m.17sec 3et=0m.16sec

mysql 5.5.60 1et=0m.18sec 2et=0m.16sec 3et=0m.15sec

mysql 5.5.36 1et=0m.14sec 2et=0m.14sec

mysql 5.1.73 1et=0m.18sec 2et=0m.17sec 3et=0m.16sec

mysql 5.0.91 1et=0m.14sec 2et=0m.13sec 3et=0m.14sec

where et is the execution time.

how I did the measurement:

mysql> create database mysqldumpdatabasename;

mysql> use mysqldumpdatabasename;

mysql> set @str=now();source d:\mysqldumpdatabasename.sql;SELECT TIMESTAMPDIFF(SECOND,@str,now());

Your answers are appreciated.