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Output slow for 1/2 second, then fast #20113
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Issue-BugIt either shouldn't be doing this or needs an investigation.It either shouldn't be doing this or needs an investigation.Needs-AttentionThe core contributors need to come back around and look at this ASAP.The core contributors need to come back around and look at this ASAP.Needs-TriageIt's a new issue that the core contributor team needs to triage at the next triage meetingIt's a new issue that the core contributor team needs to triage at the next triage meeting
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Issue-BugIt either shouldn't be doing this or needs an investigation.It either shouldn't be doing this or needs an investigation.Needs-AttentionThe core contributors need to come back around and look at this ASAP.The core contributors need to come back around and look at this ASAP.Needs-TriageIt's a new issue that the core contributor team needs to triage at the next triage meetingIt's a new issue that the core contributor team needs to triage at the next triage meeting
Windows Terminal version
1.25.2604.02003 (preview) (1.25.923.0) and the previous 1.25 preview
Windows build number
10.0.26200.8037 (25H2)
Other Software
TCC shell; v36
Steps to reproduce
N.B., I have many versions of TCC and WT 1.25, WT 1.24, and WT 1.23 (Store install). I can only observe this behavior with WT 1.25 and the newest TCC (v36, now in public beta).
First, wait a while (an hour, several hours, overnight?). When this behavior begins varies and it doesn't seem to have anything to with what I do. Then do any of these: press [up] for command history recall, paste into a command line, run a command.
Expected Behavior
Normal output
Actual Behavior
If I press [up] a recalled command appears on the command line slowly; there's no delay, the characters just stream slowly across the screen. If the recalled command is long enough, after about 1/2 second of slowness, it becomes fast, as usual.
If I paste to a command line the pasted characters appear slowly. If the pasted data is long enough, after about 1/2 second of slowness, it becomes fast, as usual.
If I execute, for example, DIR, the initial output (about 1/2 second, several lines) is slow, thereafter fast.
If I press and hold [up] the result is much like executing DIR ... as I go through the command history output is slow for about 1/2 sec (several lines), then fast.
Once this behavior starts all of the above happen and in several weeks of investigating I haven't found a way to stop it. I must emphasize, there are no outright delays, just slow output followed by normally fast output.
I new instance of the shell (replacing the old one) started with TCC's EXEC command (same ConPty I believe) inherits this problem.