ID Activity Title Status
36012 5 hours ago Investigate slow writes to class variables has PR open
29202 yesterday Improve dict iteration has patch has PR open
35996 yesterday Optional modulus argument for new math.prod() function open
35915 1 week ago re.search extreme slowness (looks like hang/livelock), searching for patterns containing .* in a large string open
35292 3 weeks ago Make SimpleHTTPRequestHandler load mimetypes lazily has PR open
28607 3 weeks ago C implementation of parts of copy.deepcopy has patch open
29871 1 month ago Enable optimized locks on Windows has PR open
29406 2 months ago asyncio SSL contexts leak sockets after calling close with certain Apache servers has patch has PR open
25430 2 months ago speed up ipaddress __contain__ method has patch has PR open
30230 2 months ago Move quick test in PyObject_IsSubClass outside of PyType_CheckExact guard open
11107 2 months ago Cache constant "slice" instances open
32477 2 months ago Move jumps optimization from the peepholer to the compiler has PR open
35295 2 months ago Please clarify whether PyUnicode_AsUTF8AndSize() or PyUnicode_AsUTF8String() is preferred open
35195 3 months ago [Windows] Python 3.7 initializes LC_CTYPE locale at startup, causing performance issue on msvcrt isdigit() open
35210 3 months ago Use bytes + memoryview + resize instead of bytesarray + array in io.RawIOBase.read has PR open
34396 3 months ago Certain methods that heap allocated subtypes inherit suffer a 50-80% performance penalty open
34561 4 months ago Replace list sorting merge_collapse()? open
25095 4 months ago test_httpservers hangs since Python 3.5 has PR open
32215 5 months ago sqlite3 400x-600x slower depending on formatting of an UPDATE statement in a string has patch has PR open
34749 5 months ago improve performance of binascii.a2b_base64() has PR open
28307 5 months ago Accelerate 'string' % (value, ...) by using formatted string literals has PR open
34535 5 months ago queue.Queue(timeout=0.001) avg delay Windows:14.5ms, Ubuntu: 0.063ms open
34488 5 months ago improve performance of BytesIO.writelines() by avoiding creation of unused PyLongs has PR open
24076 6 months ago sum() several times slower on Python 3 64-bit has patch open
34296 6 months ago Speed up python startup by pre-warming the vm open
34303 6 months ago micro-optimizations in functools.reduce() has PR open
33092 6 months ago The bytecode for f-string formatting is inefficient. has PR open
34152 7 months ago performance of some list slice assignment margin cases can be improved has PR open
34090 7 months ago Python function call optimization: avoid temporary tuple to pass **kwargs open
32949 7 months ago Simplify "with"-related opcodes has PR open
33964 7 months ago IDLE maxosc.overrideRootMenu: remove unused menudict has PR open
27575 8 months ago dict viewkeys intersection slow for large dicts has patch has PR open
33587 8 months ago inspect.getsource performs unnecessary filesystem stat call has PR open
33838 8 months ago Very slow upload with http.client on Windows when setting timeout open
33793 8 months ago asyncio: _ProactorReadPipeTransport reads by chunk of 32 KiB: chunk size should be configurable open
33500 8 months ago Python TKinter for Mac on latest 2.7.15 still extremely slow vs Windows open
33521 8 months ago Add 1.32x faster C implementation of asyncio.isfuture(). has patch has PR open
32411 9 months ago Idlelib.browser: stop sorting dicts created by pyclbr has PR open
32534 9 months ago Speed-up list.insert: use memmove() has PR open
33440 9 months ago Possible lazy import opportunities in `pathlib` has PR open
21592 9 months ago Make statistics.median run in linear time has patch has PR open
33431 9 months ago Change description about doc in programming, faq. has PR open
32616 9 months ago Significant performance problems with Python 2.7 built with clang 3.x or 4.x has PR open
33326 9 months ago Convert collections (cmp_op, hasconst, hasname and others) in opcode module to more optimal type open
32823 10 months ago Regression in test -j behavior and time in 3.7.0b1 open
33228 10 months ago Use Random.choices in tempfile has PR open
32147 11 months ago improve performance of binascii.unhexlify() by using conversion table has PR open
32856 11 months ago Optimize the `for y in [x]` idiom in comprehensions has PR open
32846 12 months ago Deletion of large sets of strings is extra slow open
32801 12 months ago Lib/_strptime.py: utilize all() open
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