#32778: Compile alphanumeric regex for CSRF middleware at module level.
-------------------------------------+-------------------------------------
     Reporter:  Abhyudai             |                    Owner:  nobody
         Type:                       |                   Status:  new
  Cleanup/optimization               |
    Component:  CSRF                 |                  Version:  3.2
     Severity:  Normal               |               Resolution:
     Keywords:  middleware, csrf     |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Abhyudai):

 For what's it worth, the results for the `default_middleware` section when
 run on my machine when comparing the patch branch to the main branch were:
 {{{
 Control: Django 4.0.dev20210524043148 (in git branch main)
 Experiment: Django 4.0.dev20210524043148 (in git branch feat/optimize-
 csrf)

 Running 'default_middleware' benchmark ...
 Min: -0.000020 -> -0.000111: 0.1772x faster
 Avg: 0.000751 -> 0.000740: 1.0160x faster
 Not significant
 Stddev: 0.00529 -> 0.00522: 1.0144x smaller (N = 50)
 }}}

 Although, I'm not sure if this just tests the changes for the `Csrf` class
 since the default middleware includes a lot more things.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/32778#comment:1>
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