lag makes the example app unusable

[euri10]

greetings, 1st time user and running the python -m textual leads to the app being very laggy, pretty much unusable being so slow, I made a video recording (cant link it here but let me know if you want it) where I just run the app like in the docs, then it starts scrolling down without me pressing any input, as you'll see I have hard time selecting the inputs, finally enters a and b in it, then use my mouse wheel, it scrolls down line by line very laggy, I have to exit it pressing ctrl+c

when I ctrl+c it lefts me garbage in my console

[euri10]

tested in my terminal and it works fine, there should be something then with the Pycharm terminal

[davep]

A good place to start would be to tell us more about how and where you're attempting to run the demo; when you first raised this as an issue the issue template will have asked you to run textual diagnose; if you're still looking for help with this that sort of information will be vital to helping.

[euri10]

this is the output of diagnose, I tried it a my Pycharm terminal

Textual Diagnostics

Versions

Name	Value
Textual	0.47.1
Rich	13.7.0

Python

Name	Value
Version	3.9.9
Implementation	CPython
Compiler	GCC 12.2.0
Executable	/home/lotso/.cache/pypoetry/virtualenvs/litestar-recipes--zOplDFp-py3.9/bin/python

Operating System

Name	Value
System	Linux
Release	6.1.0-17-amd64
Version	#1 SMP PREEMPT_DYNAMIC Debian 6.1.69-1 (2023-12-30)

Terminal

Name	Value
Terminal Application	Unknown
TERM	xterm-256color
COLORTERM	Not set
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=224, height=53
legacy_windows	False
min_width	1
max_width	224
is_terminal	True
encoding	utf-8
max_height	53
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

[davep]

Ahh, I see, thanks. The PyCharm terminal isn't a very capable terminal, from what I've seen. you could test the Textual demo against other full-screen terminal applications in the PyCharm terminal to see how they perform.

[euri10]

ok fair enough that was already what I noticed, this however leads to the question of how do people develop textual apps then

1. do I have to go back and forth from pycharm to a "powerful-enough" terminal ?
2. how to use step debugging then ?
3. does vs code provides a better dx experience ?

[TomJGooding]

I don't use PyCharm or VSCode myself, but from what I've seen Textual runs far better in the VSCode integrated terminal.

But Textual is designed to be run in a terminal emuator, and to quote @davep in a similar discussion recently:

More generally, the terminals provided by some IDEs tend to be quite cut-down and not a great place to run terminal-based applications in general (think of it as trying to test a full-featured website with all the bells and whistles, in a text-only web browser, and expecting to see all the fancy bells and whistles).

All that being said, if you really want to stick with PyCharm there's apparently a setting you could try which might make Textual at least somewhat usable.

[euri10]

thanks for the links @TomJGooding , I definitely should have found this myself but looking at issues led nowhere, a small mention in the docs would have been awesome, provided I had read it of course :)

[euri10]

textual_lag.mp4

[euri10]

1st example from the tutorial doesnt work:

textua_tutorial_example-2024-01-13_09.23.10.mp4