[BUG] Flickering large progress display on Alacritty

Describe the bug

I have a progress bar that sometimes has up to 20 items, and it flickers kind of annoyingly.

I made a representative example that flickers:

from rich.progress import (
    Progress,
    TimeElapsedColumn,
    SpinnerColumn,
    TimeRemainingColumn,
    TransferSpeedColumn,
    BarColumn,
    DownloadColumn,
)
from rich.console import Console
import time


def gen_stream():
    for i in range(20):
        msg = {"bar": i, "total": 1, "completed": 0}
        yield msg
    for i in range(20_000):
        cycle = int(i / 20)
        bar_num = i % 20
        msg = {"bar": bar_num, "total": 1000, "completed": cycle}
        yield msg


def main():
    console = Console(record=True)
    bars = {}

    with Progress(
        SpinnerColumn(),
        BarColumn(),
        DownloadColumn(),
        TransferSpeedColumn(),
        TimeElapsedColumn(),
        TimeRemainingColumn(),
        console=console,
        transient=True,
    ) as progress:

        for msg in gen_stream():
            bar = msg["bar"]
            if bar not in bars:
                bars[bar] = progress.add_task("bar1", start=False, total=1)
            else:
                to_update = {}
                task_id = bars[bar]
                task = progress._tasks[task_id]
                if not task.started:
                    progress.start_task(bars[bar])
                if task.total == 1:
                    to_update["total"] = msg["total"]
                to_update["completed"] = msg["completed"]

                progress.update(task_id, **to_update)
            time.sleep(0.01)


if __name__ == "__main__":
    main()

Platform

Mac OSX with Alacritty

What platform (Win/Linux/Mac) are you running on? What terminal software are you using?

Mac OSX with Alacritty as a terminal, however I’ve had the same issue on a Linux box as well. NOTE: It seems to perform fine on iterm

I may ask you to copy and paste the output of the following commands. It may save some time if you do it now.

If you’re using Rich in a terminal:

poetry run python -m rich.diagnose
╭───────────────────────── <class 'rich.console.Console'> ─────────────────────────╮
│ A high level console interface.                                                  │
│                                                                                  │
│ ╭──────────────────────────────────────────────────────────────────────────────╮ │
│ │ <console width=205 ColorSystem.TRUECOLOR>                                    │ │
│ ╰──────────────────────────────────────────────────────────────────────────────╯ │
│                                                                                  │
│     color_system = 'truecolor'                                                   │
│         encoding = 'utf-8'                                                       │
│             file = <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'> │
│           height = 53                                                            │
│    is_alt_screen = False                                                         │
│ is_dumb_terminal = False                                                         │
│   is_interactive = True                                                          │
│       is_jupyter = False                                                         │
│      is_terminal = True                                                          │
│   legacy_windows = False                                                         │
│         no_color = False                                                         │
│          options = ConsoleOptions(                                               │
│                        size=ConsoleDimensions(width=205, height=53),             │
│                        legacy_windows=False,                                     │
│                        min_width=1,                                              │
│                        max_width=205,                                            │
│                        is_terminal=True,                                         │
│                        encoding='utf-8',                                         │
│                        max_height=53,                                            │
│                        justify=None,                                             │
│                        overflow=None,                                            │
│                        no_wrap=False,                                            │
│                        highlight=None,                                           │
│                        markup=None,                                              │
│                        height=None                                               │
│                    )                                                             │
│            quiet = False                                                         │
│           record = False                                                         │
│         safe_box = True                                                          │
│             size = ConsoleDimensions(width=205, height=53)                       │
│        soft_wrap = False                                                         │
│           stderr = False                                                         │
│            style = None                                                          │
│         tab_size = 8                                                             │
│            width = 205                                                           │
╰──────────────────────────────────────────────────────────────────────────────────╯

poetry show rich
 poetry show rich
name         : rich
version      : 10.16.2
description  : Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal

dependencies
 - colorama >=0.4.0,<0.5.0
 - commonmark >=0.9.0,<0.10.0
 - pygments >=2.6.0,<3.0.0
 - typing-extensions >=3.7.4,<5.0

[mmu094]

Adding rails!!

Get Outlook for Androidhttps://aka.ms/AAb9ysg

---

From: Sergey Polzunov @.> Sent: Monday, October 17, 2022 3:59:51 PM To: Textualize/rich @.> Cc: mmu094 @.>; Comment @.> Subject: Re: [Textualize/rich] [BUG] Flickering large progress display on Alacritty (Issue #2139)

I’m experiencing a similar issue – wild flickering in the iTerm if the hyperlink output is used. Not only that, CPU usage of iTerm2 jumps to 70-80%. Setting refresh_per_second to 5 seconds helped a bit when only a few progress bars are shown, but has no effect on flickering with, say, 20 progress bars active

— Reply to this email directly, view it on GitHubhttps://github.com/Textualize/rich/issues/2139#issuecomment-1280678187, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AX2N6YFVUFJGRXM6Y5I3W4LWDUWSPANCNFSM5SGJC3VA. You are receiving this because you commented.Message ID: @.***>

[traut]

I’m experiencing a similar issue – wild flickering in the iTerm if the hyperlink output is used. Not only that, CPU usage of iTerm2 jumps to 70-80%. Setting refresh_per_second to 5 seconds helped a bit when only a few progress bars are shown, but has no effect on flickering with, say, 20 progress bars active