akrimony12 the number of extensions is usually not the cause of bad performance. You can have hundreds of extensions without any issue.
The performance hit depends on which extensions you use. Extension that process something every time the homepage renders will have a greater impact than extensions that only do something on demand. Different extensions will impact different parts of Flarum (homepage, search, posting, etc...)
The impact of extensions is usually also linked to the number of posts or users you have. Even badly written extension usually work fine on small forums. When you have hundreds of thousands of discussions or posts you start to notice the problems, and even then any performance issue can usually be addressed by fixing the extension code.
