PERF: faster dataframe construction from recarray

[GYHHAHA]

• closes PERF: dataframe construction from recarray is slow #44826
• tests added / passed
• Ensure all linting tests pass, see here for how to run them
• whatsnew entry

n = int(1e6)
df = pd.DataFrame({"A": [.0]*n})
arr = df.to_records(index=False)

In [1]: %timeit pd.DataFrame(arr)
3.64 s ± 77.3 ms per loop (mean ± std. dev. of 7 runs, 1 loop each) <- master
2.23 ms ± 421 µs per loop (mean ± std. dev. of 7 runs, 100 loops each) <- PR

[GYHHAHA]

How to add test case for performance pr? I have no experience on this.

[jbrockmendel]

How to add test case for performance pr? I have no experience on this.

for this you can just show some %timeit results comparing the PR to the status quo

[GYHHAHA]

added @jbrockmendel

[jbrockmendel]

LGTM

[jreback]

thanks @GYHHAHA