RustPython initialization is slow #1047
Description
A recent change probably made the interpreter extremely slow, this can be demonstrated by a simple benchmark:
# On current master
cargo build
target/debug/rustpython tests/snippets/strings.py 2.25s user 0.01s system 98% cpu 2.301 total`
# On master~100
cargo build
target/debug/rustpython tests/snippets/strings.py 0.13s user 0.00s system 98% cpu 0.139 totalI'm currently doing a git-bisect to identify which change introduced the poor performance, and I'll update what I find.