Most of the time, issue with the theme/plugins package are due to low server settings or 3rd party plugins.
We can't guarantee the quality and compatibility with all WordPress plugins as you can imagine, that's why we can't provide support for 3rd party plugin or services.
However, most common and well-coded WordPress plugins should work fine with your theme/plugins packages.
Here is a non-exhaustive list of plugins that we use on the demo installations or have been tested that are not already included in your theme package and works perfectly with our theme and plugins.
- Yoast SEO
- WP Super Cache
- W3 Total Cache
- Loco Translate
- Autoptimize
- UpdraftPlus - Backup/Restore
- Antispam Bee
- 404page - your smart custom 404 error page
- Better Search Replace
- Contact Form 7 Honeypot
- Duplicate Post
- EWWW Image Optimizer
- Force Regenerate Thumbnails
- Timetable and Event Schedule by MotoPress My Sites Search
- oEmbed Gist
- PixProof
- Post Types Order
- Reorder My Sites
- Seamless Sticky Custom Post Types
- Widgets in Menu for WordPress
- WordPress Reset
- WordPress Importer v2
- WP User Avatars
- WP CDN Rewrite
- WPML