[python-win32] Dispatch vs EnsureDispatch performance

[Sven Bardos]

Hi,

shouldn't be EnsureDispatch be faster than Dispatch once the code
generation is done?

I've measured it by calling 6000 COM calls like this:

dirpath = Path('C:/Users/sbardos/AppData/Local/Temp/gen_py/3.10/')
if dirpath.exists() and dirpath.is_dir():
    shutil.rmtree(dirpath)

app = Dispatch("CT.Application")
job = app.CreateJobObject()

start = timer()

for i in range(2000):
    cnt, devIds = job.GetAllDeviceIds()
    cnt, sheetIds = job.GetSheetIds()
    dev = job.CreateDeviceObject()

end = timer()
print(f"Time ellapsed (late): {end - start}s")

and the ensure Dispatch version:

app = EnsureDispatch("CT.Application")
job = app.CreateJobObject()

start = timer()

for i in range(2000):
    cnt, devIds = job.GetAllDeviceIds(None)
    cnt, sheetIds = job.GetSheetIds(None)
    dev = job.CreateDeviceObject()

end = timer()
print(f"Time ellapsed (early): {end - start}s")


EnsureDispatch is a little bit slower ~4.2s compared to ~4.0s.
If I don't get a performance boost with EnsureDispatch, is there even a
point using it?

Thanks,
Sven
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