Will it work with wp fastest cache?

Good day!

We tried your pluugin in a way to make fewer http requests and hence increase the speed of the site, but it turned out the other way around. We have wp fastest cache free version implemented. Will it work with this plugin? If so, what is the configuration needed in your plugin to make it work and increase our site speed?

By the way, we tried to deselect some of the choices you have and it doesn’t save the changes. Is this on purpose?

In advance, thank you for your help and interest.