New submission from raymin <guo.raymin@gmail.com>: # testList.py L = [] i = 0 while i < 100000: L.append('k%d' % i) i += 1 i = 0 while i < 100000: if i & 1: k = L[0] del L[0] L.insert(i, k) else: k = L[i] del L[i] L.append(k) i += 1 print i, len(L) time python testList.py : 0m6.710s time pypy testList.py : 0m41.702s ---------- title: PyPy list element del insert to slow -> PyPy list element del insert too slow ________________________________________ PyPy bug tracker <tracker@bugs.pypy.org> <https://bugs.pypy.org/issue1093> ________________________________________