logilab-astng #18311 pylint is slower with astng 0.19.1 [rejected]

With logilab-astng 0.19.1, pylint is significantly slower when dealing with multiple files at a time. The following tests use pylint 0.18.0 and logilab-astng 0.19.1 and logilab-astng 0.19.0, but the effect is also very obvious with pylint 0.18.1.

Timing values on one of my projects:

$ time ~/tmp/pylint-0.18.0-0.19.0/bin/pylint -r n [A-F]*py > /dev/null
No config file found, using default configuration
real    0m11.053s
user    0m10.673s
sys     0m0.340s

$ time ~/tmp/pylint-0.18.0-0.19.1/bin/pylint -r n [A-F]*py > /dev/null
No config file found, using default configuration
real    0m17.977s
user    0m17.549s
sys     0m0.412s

$ ls [A-F]*py | wc -l
12

The time for 0.19.1 shows significant growth - for 14 files, the times are 12s for 0.19.0, but 22s for 0.19.1, and for all 16 files, 14s versus 50s.

Memory usage for pylint with 0.19.1 seems larger as well (based on watching top), but I haven't measured that accurately,

The project in question uses gtk quite extensively, which may be a factor in triggering this bug - the slowdown is less noticeable on my non-gtk projects.