Apache Performance Settings
In case you want to tweak httpd.conf then this Apache Performance Settings page can give you some tips: https://httpd.apache.org/docs/1.3/misc/perf-tuning.html
Keywords: Tweak Apache, httpd, conf.
There are so many methods for tweaking for apache performance that it will blow your mind. You cannot only focus on the https.conf file, but you may also have to look at my.conf which also controls MySQL processes. Then you have to take into consideration the amount of RAM you have available, sever CPU and disk space.
Sometimes if you just do a full reboot of your server then you'll find everything readjusts just fine. Most hosts already tweak everything for you, but because of updates in between you may need a full restart not a partial restart of just httpd.