The output of plank is as follows.
caleb@calebs-pi:~$ plank
[WARN 12:33:36.708516] [Environment:161] XDG_SESSION_CLASS not set in this environment!
[WARN 12:33:41.822616] [SurfaceCache:196] Creating surface took WAY TOO LONG (255ms), enabled downscaling for this cache!
[WARN 12:33:41.890470] [SurfaceCache:196] Creating surface took WAY TOO LONG (46ms), enabled downscaling for this cache!
[WARN 12:33:41.954726] [SurfaceCache:196] Creating surface took WAY TOO LONG (32ms), enabled downscaling for this cache!
[WARN 12:33:42.015740] [SurfaceCache:196] Creating surface took WAY TOO LONG (43ms), enabled downscaling for this cache!
[WARN 12:33:42.078018] [SurfaceCache:196] Creating surface took WAY TOO LONG (42ms), enabled downscaling for this cache!
[WARN 12:33:42.140793] [SurfaceCache:196] Creating surface took WAY TOO LONG (45ms), enabled downscaling for this cache!
[WARN 12:33:42.209100] [SurfaceCache:196] Creating surface took WAY TOO LONG (30ms), enabled downscaling for this cache!
[WARN 12:33:42.266109] [SurfaceCache:196] Creating surface took WAY TOO LONG (34ms), enabled downscaling for this cache!
[WARN 12:33:52.159281] [SurfaceCache:196] Creating surface took WAY TOO LONG (62ms), enabled downscaling for this cache!