Architecture and interior work is the worst case for image weight: a single high-resolution render is often 8-25 MB, a project page carries fifteen of them, and the visitor is a potential client on a laptop tethered to hotel wifi. The reason renders are so heavy is not resolution, it is content. A render is full of smooth gradients — sky, wall washes, polished concrete, glass reflections, soft shadows — and every one of those gradients is where JPEG spends its bits. Flat painted walls and a clean skyline compress to almost nothing while a dusk exterior with foliage detail refuses to shrink. Compressing without checking is how portfolios end up with banded skies and muddy shadow falloff, which reads as a cheap render even when the model was excellent. The practical answer is a two-axis approach: resize to the width the page actually renders at, then compress on a setting you have eyeballed on a gradient-heavy frame rather than a flat one. Skwish does that in the browser for PNG, JPG and WebP with a per-file before/after readout and a ZIP download for a whole project, so nothing leaves your machine. Relevant because most submission portals are unforgiving: Architizer caps individual files under 10MB at minimum 1200px wide, while the Architecture MasterPrize caps every image at 4MB.