At my frst job I once had to fix a wordpress site that was 'too slow' which loaded a 12MB 4k by 4k favicon. I kid you not. It also loaded jquery 4 times, had about 20 unminified stylesheets linked in the header. When I told this to my manager he told me 'oh but you only need to load that stuff once and then its cached, so that can't be an issue'. I did not last long in that place. The backend was even more of a wasteland.