Plex started severely slowing my LAN; movies are blocking

In the last few days, Plex started slowing my wifi network radically. Measuring against fast.com from a smartphone, I reproducibly get 10 Mbps when I am not playing a movie and 500-600 kbps Mbps when I am. Most movies to a standstill.

Nothing has changed in the wireless configuration.

Also, YouTube from the same device displays with no slow-down.

I understand that excessive load can slow a wifi network, but other uses of the network, including media-heavy ones, do not cause problems.

How can I go about solving this?

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