Hi DenisMariano is currently deciding what to do with it. See issue��https://pharo.fogbugz.com/f/cases/20044/ DelayMillisecondScheduler- leads-to-UI-lockup Cheers,MaxOn 16 May 2017, at 14:29, Denis Kudriashov <dionisiydk@gmail.com> wrote:Hi.I found that baseline of OSSubprocess project modifies delay scheduler class.Is it still needed?��Is it related to itimer heartbeat VM issues?