wesm opened a new pull request #7735:
URL: https://github.com/apache/arrow/pull/7735
Using a fairly large IPC stream file:
Before:
```
In [1]: timeit pa.ipc.open_stream('nyctaxi.arrow').read_all()
129 ms ± 1.51 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
```
After
```
In [1]: timeit pa.ipc.open_stream('nyctaxi.arrow').read_all()
87.6 ms ± 1.68 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
```
I found some other performance concerns with the internals of this operation
that I reported as ARROW-9441.
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