That's too simplistic. Programs with hot code sections that don't fit in icache are slow programs. If your program is huge but you spend all your time in a smal

That's too simplistic. Programs with hot code sections that don't fit in icache are slow programs. If your program is huge but you spend all your time in a small fraction of code (typical) that fits in icache (no idea if that's typical), it's fine from a cache performance perspective.