E. Paine <[email protected]> added the comment:
This *appears* to be a Tk issue. I ran a benchmark (see attached) which
repeatedly performed canvas actions. The first test ("clearing") clears the
canvas, creates a rectangle, then calls both `update` and `update_idletasks`.
The second test ("not clearing") is the same as the above but did not clear the
canvas (causing rectangles to be drawn over each other). Here is a table of the
results (times are per iteration in milliseconds):
+------------+-------------------------+-------------------------+
| Tk Version | Python | Wish |
| +----------+--------------+----------+--------------+
| | clearing | not clearing | clearing | not clearing |
+============+==========+==============+==========+==============+
| 8.6.8 | 6.6 | 41.4 | 4.2 | 16.2 |
+------------+----------+--------------+----------+--------------+
| 8.6.11 | 37.0 | 37.1 | 36.1 | 36.1 |
+------------+----------+--------------+----------+--------------+
A few notes:
- These were performed on a slow machine and results could be influenced by
background CPU usage fluctuations
- Because it is a slow computer, I limited the iterations to just 1000 per test.
- Python version was 3.9.2
- Wish 8.6.8 was installed using an ActiveTcl binary whereas 8.6.11 was
installed through homebrew
----------
Added file: https://bugs.python.org/file49905/tkbench.zip
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