less/less.js — pull request #1625 by fredburger (2013-10-30 08:04:21+00:00)
Title: Performance tuning (#1615)

**Performance tuning (#1615)**

Various performance optimizations, without refactoring or messing up too much (hopefully?).

33% - 50% reduction in compilation time for bootstrap.less.

Compilation times for *bootstrap.less*:

| Env. | Mode | 1.5.0-master | 1.5.0-perf-tune | % reduction |
| ------------ | ------------------------ | :----------------: | :-------------------: | :---------------: |
| Node | lessc (single run) | 719 ms | 484 ms | -33% |
| Node | JIT'ed (8 runs) | 509 ms | 228 ms | -55% |
| FF | Browser | 2198 ms | 832 ms | -62% |
| Chrome | Browser | 1092 ms | 797 ms | -27% |
| IE9 | Browser | 1720 ms | 965 ms | -44% |