WordPress is so powerful because of the thousands of plugins and themes available out there. Unfortunately not all plugins are coded in the WordPress way and some of them can really harm a site, especially under high traffic conditions.
This is why we've put in place a list of banned plugins, which are not working on our platform for various reasons. Here's the list of them, with some explanation about why we ban them and also a replacement recommendation.
We already have a solution in place for posts missing their scheduled auto post time
These plugins usually write in the DB every page view for every post. You can imagine that this is not a very good practice for sites with hundreds of thousands of views (either per day, week or month). We have built for this the plugin Toplytics which pulls this data from your Google Analytics account and safely serves it as a configurable widget and we strongly recommend it as an alternative for all the plugins below.
This set of plugins is doing dynamic requests to WordPress' backend breaking our caching mechanism and bringing sites down.
These plugins put a lot of pressure on the SQL, either by doing tons of useless queries, either by running giant queries which are clogging the database, or by writing huge options in the DB.
Based on our security policy we don't allow direct DB access in order to avoid possible exploits and hacks through DB queries. Here's a list of banned plugins because of that.
We have a very tight backup policy which enables backups on multiple layers and in different locations. Most backup plugins are not friendly with sites having a large DB or tens of GB of data in their uploads folder. We therefore suggest contacting our support team for any backup needs.