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Playback slow with large static Text Object
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Description

System Information
Windows7 x64, GTX 1070

Blender Version
2.79

When adding a Text object with 100+ words, the animation playback speed goes down to <10fps
It the only value it seems to be related is the 'Preview U' Resolution.

Looks like the Dependency Graph rebuilds the whole Text-Mesh on every frame, even if there is nothing animated.

Event Timeline

ronan ducluzeau (zeauro) triaged this task as Confirmed, Medium priority.

Confirmed on ubuntu with master 7c64e33 and official 2.79

In attached .blend file, I used Lyapunov Texture Template to create a long 3D text object.
At default Preview resolution of 12, it corresponds to 254 193 tris interpolated. At Preview U resolution set at 1, it correspond to 33 973 tris. Of course playback is a little bit better but not great.

And it becomes really unacceptable when draw type is set to Bounds to reduce display of text to a wire of 4 lines : there is no improvement of fps.

Edit; Oops. It looks like problem does not exist when blender is launched with new depsgraph.
By typing in commandline blender --enable-new-depsgraph, there is no more problem.
Is it something that should be supported by legacy depsgraph in 2.79a ?

Damjan (Atair) added a comment.EditedNov 29 2017, 1:39 AM

With the new depsgraph the playback lag is gone, but a new problem is introduced:
Transforming (Moving) The Textobject is now very slow / choppy.
Easily noticeable with 250+ Words
Should this go into a separate task?