14w04a server spews debug messages

Copious output – so much that server lags – like:

[09:03:59 DEBUG]: OUT: [PLAY:25] ii[id=814, rot=103]
[09:03:59 DEBUG]: OUT: [PLAY:23] hv[id=815, xa=9, ya=6, za=0, yRot=-42, xRot=0]
[09:03:59 DEBUG]: OUT: [PLAY:25] ii[id=815, rot=-95]
[09:03:59 DEBUG]: OUT: [PLAY:3] iv[time=301115682,dtime=35642067]
[09:03:59 DEBUG]: OUT: [PLAY:25] ii[id=594, rot=109]
[09:03:59 DEBUG]: OUT: [PLAY:18] in[id=163, x=0.00, y=0.02, z=0.00]
[09:03:59 DEBUG]: OUT: [PLAY:28] il[]
[09:03:59 DEBUG]: OUT: [PLAY:18] in[id=176, x=0.00, y=-0.04, z=0.00]