John Fremlin's guide to writing fast code

These haven't shown up on Planet Lisp, but they're definitely worth reading if you want to know how to write fast Common Lisp code:

• John Fremlin's blog: How to optimise Common Lisp under SBCL: introduction
• John Fremlin's blog: How to optimise Common Lisp under SBCL: planning
• John Fremlin's blog: How to optimise Common Lisp under SBCL: the garbage collector
• John Fremlin's blog: How to optimise Common Lisp under SBCL: object pools
• John Fremlin's blog: How to optimise Common Lisp under SBCL: builtins

I'm looking forward to more installments.