If ext_imagick is faster and can be used. (per comments above)

Why do multiple requests appear to come from Piwigo for conversions to ext_magick as per the logs.

For a "Square", "Thumbnail", "Medium", "Large" generate multiple images request. There appears to be four requests for the file and four outputs.

Why not one request and four outputs?

1 in 2 out sample request

Example: magick input.jpg \( -clone 0 -resize 100x100 -write thumb.jpg \) \( -clone 0 -resize 800x800 -write large.jpg \) null:

K910