MySQL slower than SQL Server?

I'm not surprised at all by your findings. I was involved with a
project that required optimal insert performance and was eventually
forced to drop MySQL entirely after much tweaking and
experimentation. After converting the application to use an OpenBase
database, insert performance went up by about a factor of 10 and we
were finally able to handled the high rate of inserts our application

Don't misunderstand me, I use MySQL wherever and whenever possible.
But, if your looking for maximum performance, especially for inserts
and updates, MySQL is likely not the right fit for the job.

Others may have different experiences, but I was very impressed by the
difference in performance between MySQL and OpenBase. Sorry I've
never tried comparing MySQL and MS SQL Server since I don't use
Windows or any MS Technology.