Update: this app unfortunately didn't work together with another essential app we are using. It looks like it deletes some JS unused which potentially slows the website. But these are many times used offline by other apps. Nice developers though, give them a shot, it might work with your settings. Initial comment before these issues:
Great app, it does improve the download speeds. A few issues are resolved by the developer. The developer disclosed that technically Swish app improves the loading mechanism of the resources which are causing speed issues. That is so true, verified by GTmetrix the resources such as page sizes and request counts are cut down almost to half. Wow!
Thank you so much for the amazing review. This made our day 🤩