BuddyPress one of the most popular community plugin with regular updates and 2 lakh plus installations already indicates about positive performance.
But the question arises how to know if the plugin is good in terms of performance, so here we will discuss in brief to follow some steps for the same:
Check plugin performance – You can use the P3 plugin for checking the plugin performance, however, it is not updated from a long time so you can also use website performance tools that tell a lot about every component and about a problematic plugin too. You can use GTmetrix or Google page speed test tools.
Follow all WP standards – Next important aspect to test if the plugin is good is that it should follow all WP standards and there should not be any errors or warnings.
Good in terms of security – code sanitization and all
CSS and JS minification