pyproj crs equality comparison became much slower in 3.0

[mityakrylov]

Code Sample, a copy-pastable example if possible

WGS = CRS4326 = pyproj.CRS('epsg:4326')

WGS == CRS4326

Problem description

Test for equality takes about ~10ms on pyproj==3.0.1 and ~10µs on pyproj==2.6.0. I measured in jupyter notebook using timeit cell magic:

%%time
WGS == CRS4326

I noticed that when function that was applied to thousands of geometries became much slower after pyproj upgrade. And the main reason was increased time for crs comparison.

Is this expected behavior in pyproj==3.0.1? If yes, what is better way to test crs for equality? Maybe something like this:

WGS.srs == CRS4326.srs

?

Environment Information

for pyproj==3.0.1:

pyproj info:
    pyproj: 3.0.1
      PROJ: 7.2.1
  data dir: /home/user/envs/bp/lib/python3.6/site-packages/pyproj/proj_dir/share/proj
user_data_dir: /home/user/.local/share/proj

System:
    python: 3.6.9 (default, Jul  3 2019, 15:36:16)  [GCC 5.4.0 20160609]
executable: /home/user/envs/bp/bin/python3
   machine: Linux-4.15.0-107-generic-x86_64-with-Ubuntu-16.04-xenial

Python deps:
       pip: 20.0.2
setuptools: 46.1.3
    Cython: None

for pyproj==2.6.0:

pyproj info:
    pyproj: 2.6.0
      PROJ: 6.3.1
  data dir: /home/user/envs/bp/lib/python3.6/site-packages/pyproj/proj_dir/share/proj

System:
    python: 3.6.9 (default, Jul  3 2019, 15:36:16)  [GCC 5.4.0 20160609]
executable: /home/user/envs/bp/bin/python
   machine: Linux-4.15.0-107-generic-x86_64-with-Ubuntu-16.04-xenial

Python deps:
       pip: 20.0.2
setuptools: 46.1.3
    Cython: None

Installation method

pip3 install pyproj==3.0.1
pip3 install pyproj==2.6.0

[snowman2]

I wonder if using PROJ 8.1+ speeds things up: OSGeo/PROJ#2738 (comment)

[snowman2]

Looks like it has been resolved with PROJ 8.1+:

python -m timeit -s "import pyproj; crs = pyproj.CRS(4326)" "assert crs == crs"

100000 loops, best of 5: 3.38 usec per loop

Version information:

pyproj: 3.1.0
PROJ: 8.1.0