Let $\chi'_f(G)$ be the fractional chromatic index.

Based on limited experiments (up to 8 vertices and few larger graphs), I suspect:

Conjecture For perfect graphs $\lceil \chi'_f(G) \rceil = \chi'(G)$

Sage's fractional_chromatic_index() is not efficient for me, is there another implementation?

Counterexamples are welcome.

Let $\chi'_f(G)$ be the fractional chromatic index.

Based on limited experiments (up to 8 vertices and few larger graphs), I suspect:

Conjecture For perfect graphs $\lceil \chi'_f(G) \rceil = \chi'(G)$

Conjecture 2 (new) For cubic claw-free perfect graphs $\lceil \chi'_f(G) \rceil = \chi'(G)$

Conjecture 3 (new) For claw-free perfect graphs $\lceil \chi'_f(G) \rceil = \chi'(G)$

Sage's fractional_chromatic_index() is not efficient for me, is there another implementation?

Counterexamples or proof (especially of (2)) are welcome.

Observe that the question is about edge coloring, not for vertex coloring.