I have been using Scalability Pro for a good few years now with no complaints. It's a great plugin and has lots of great little optimisation settings that can really boost your speed on both the front and backend of your site. Our backend was getting really slow and would even crash sometimes when using it. Scalability Pro has helped with this tremendously. The Discord server is very active and provides helpful and fast support too.

I'm super happy with this plugin! We went from 30s product page load to 1s, which is marvelous for a product with 800+ variations. One big reminder for myself and tip for others : LOG OUT OF WP-ADMIN!!! Being logged in also show the private and unpublished posts, which doesn't give the plugin the chance to show its use!

Well. Very long story in short format. I set up site for my client. All products are imported via XML / JSON from different wholesale warehouses. At the moment 26k total products / 18k in stock. With over 10k products and with Divi theme site started to slow down. Divi itself is quite heavy at these level because of per post / taxonomy templates and generating static assets per post / tax. Even if these Divi side optimizations are turned off, site is quite slow. So we started testing. Keep in mind – we had frontend assets optimized so LCP / FCP etc metrics were on par with that kind of structure. Biggest problem was on backend. For Google / GTMetrix it meant TBT (total blocking time) or as I understand – time for server to return data – that was around 12 seconds. Turned off Divi "performance" we got it 3 seconds down but still over 8 seconds. So, here comes Scalabilty Pro. At first it was like – meh, i get it down to 3 seconds. Store became usable. More or less. But after wee bit tweaking and testing, combining with Perfmatters and WP Rocket – at the moment we sit TBT 10ms dektop / 10-700ms mobile. And we can use page preloading again which previously clogged down DB. So, SSP only with indexes did a miracle on a site. With other tweaks admin pages are usable and site mostly works faster than small static pages. And this all runs on shared web hosting at zone.ee server. In another hand – Dave is awesome. Very fast support on Discord – explain problem and soon you have a solution.