René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Refactor of `axis.py`/ticking should have large performance gains","articleBody":"Right now, each `Axis` has a two lists of `Tick` objects (one major, one minor), each of which has 3 `Line` objects (for left tick, right tick and gridline) and 2 `Text` objects (for main and secondary label).  Constructing `Line` objects is rather heavy and expensive.  Refactoring this code so that each `Axis` had 3 `LineCollection` objects instead where only the points of the ticks needs to be updated, sharing all of the line style information, should be _much_ faster.\n\nOn the following simple benchmark:\n\n```\nplt.subplots(8, 8)\nplt.savefig('test.png')\n```\n\n25% of the time is spent constructing the `Line` objects.  The suggested change above should reduce the number of `Line` objects from 3*N (where N is the number of ticks, usually a dozen or so) to 3.\n","author":{"url":"https://github.com/mdboom","@type":"Person","name":"mdboom"},"datePublished":"2015-12-11T22:39:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":29},"url":"https://github.com/5665/matplotlib/issues/5665"}