It was actually 5x in 4 years (1.5x per year). As you said we see 20-30% at best. And several important workloads have important slowdowns (for example coverag

It was actually 5x in 4 years (1.5x per year). As you said we see 20-30% at best. And several important workloads have important slowdowns (for example coveragepy runs 30-50% slower). The GIL is an academic problem which has little real world relevance.