Most agency websites perform dynamism. Parallax, sticky pinning, scaled portfolio tiles, a reel set to a track. The result reads as an effort to look creative, which is the opposite of being creative.
David Ogilvy named this trap in 1983. He wrote, in his own italics, that he did not regard advertising as entertainment or an art form, but as a medium of information. The same line applies to the site you read about an agency. It is not a portfolio. It is a catalogue.
A catalogue assumes the reader will read. It uses short words, short sentences, short paragraphs. It puts the artefact on a quiet ground, names the year, names the medium, names the recognition, and gets out of the way. It does not ask the reader to be impressed by the page. It asks the reader to be impressed by the work.
The page is not the work. The page is the wall the work is hung on.