[antlr-interest] Performance Issues

[Alex Sedow]

Perfomance improvements:

Fast string class - 1.5-3 times
Custom allocators - 1.5-2 times
Using fast data structures in AST-nodes (replace homogenous tree with 
heterogenous tree) - 1.5-2 times
Removing reference counters - ?
Use multithread edition on dual-core processors (Athlon X2, Pentium D) - ?

Note: this statistics is correct for hand-written parser.

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Alex Sedow
Metaspec