Plugins slow down the site

Hello;

I use hummingbird plugin and now I do all setting and plugin working truly but site and network still too slow.

I was research and find aa problem; plugins

I must install over 100 plugin for my customer active self service. but this slow down site.

I was speed test for plugin and
most slowing plugins;
buddypress
bbpress
visualcomposer
Buddypress
hummingbird
woocommerce
ultimate addons for visual composer

I think script slows down.If I find a solution for script, site and all network will speed.