Closing as won't fix. To display text in WebGL mode, it's necessary to paste the text on to a WebGL texture. So you are held to the same maximum texture size limits as normal images, and different devices have different limits. (For example the 1st gen Nexus 7 only does 2048x2048, but my dev machine does 16384x16384.) For universal support that's 2048x2048, although 4096x4096 has something like 99% device support.