Unoptimized images are the easiest PageSpeed fix out there - and most site owners can fix them without a developer. TIO offers both a WordPress plugin and standalone Web app that automatically pick the right format (usually WebP, AVIF) and compression level. Unlike general-purpose compressors, TIO is tuned for websites - trimming image weight 35% more than competitors without sacrificing quality. The WordPress plugin comes with 50 free credits per domain, no account needed. The Web app is free.