I'm having the same issue on Mac OS running py3.7 w/ spyder 4.0 beta. hangs constantly when scrolling/typing
here's what it says on the console.
2019-11-11 10:04:28.693 python[61711:60838543] IMKClient Stall detected, *please Report* your user scenario attaching a spindump (or sysdiagnose) that captures the problem - (imkxpc_attributesForCharacterIndex:reply:) block performed very slowly (61.66 secs).
2019-11-11 10:04:28.694 python[61711:60838543] IMKClient Stall detected, *please Report* your user scenario attaching a spindump (or sysdiagnose) that captures the problem - (imkxpc_windowLevelWithReply:) block performed very slowly (59.65 secs).
2019-11-12 17:23:46.995 python[61711:60838543] IMKClient Stall detected, *please Report* your user scenario attaching a spindump (or sysdiagnose) that captures the problem - (imkxpc_attributesForCharacterIndex:reply:) block performed very slowly (17.46 secs).
2019-11-12 17:23:46.996 python[61711:60838543] IMKClient Stall detected, *please Report* your user scenario attaching a spindump (or sysdiagnose) that captures the problem - (imkxpc_windowLevelWithReply:) block performed very slowly (15.46 secs).