It is happening to me very often that to access the source of a method, or sometimes to find senders/implementors, the Calypso browser takes a long time to load it.
By long I mean from two to five seconds, sometimes longer. I'm running Pharo 7 within a VirtualBox VM with Ubuntu 16.04 in a Windows 10 host. Regards, Pharo 7.0.3 Build information: Pharo-7.0.3+build.164.sha.591a635c8922e5f1cff1d0b3fbf2e525b590d25f (64 Bit) Esteban A. Maringolo