Bad performance when logging in output panel

[yzhang-gh]

• VSCode Version: Code - Insiders 1.13.0-insider (688b96f, 2017-05-05T15:34:02.954Z)
• OS Version: Windows_NT ia32 10.0.16188

---

Steps to Reproduce:

1. Create test.py and tasks.json as below
2. Run the task
3. The output text is shown a big number of lines a time (instead of line by line in terminal).
4. And if you change range(100000) to range(1000000), vscode will freeze (become really really slow).

test.py:

for i in range(100000):
    print(i)

tasks.json:

{
    "version": "0.1.0",
    "command": "python",
    "isShellCommand": true,
    "args": ["test.py"],
    "showOutput": "always"
}

[isidorn]

Known issue, more details can be found here #22804

[isidorn]

Closing as will not fix (can not fix) due to to the most time being spent in sending json objects around.