Drawing too much can be very laggy

[yst-one]

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• I have searched the opened issues and there are no duplicates

Describe the bug

Code sample

Code

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To reproduce

The bug has existed for a long time

Expected behavior

No response

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Operating System

macOS

Operating system details

window

Flet version

0.28.6

Regression

No, it isn't

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Additional details

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[yst-one]

from threading import Thread

import flet as ft
import flet.canvas as cv

class State:
x: float
y: float

state = State()

async def main(page: ft.Page):
page.title = "Flet Brush"

async def pan_start(e: ft.DragStartEvent):
    state.x = e.local_x
    state.y = e.local_y

async def pan_update(e: ft.DragUpdateEvent):

    def a():
        cp.shapes.append(
            cv.Line(
                state.x, state.y, e.local_x, e.local_y, paint=ft.Paint(stroke_width=3)
            )
        )
        cp.update()
        state.x = e.local_x
        state.y = e.local_y
    Thread(target=a, daemon=True).start()

cp = cv.Canvas(
    content=ft.GestureDetector(
        on_pan_start=pan_start,
        on_pan_update=pan_update,
        drag_interval=10,
    ),
    expand=False,
)

page.add(
    ft.Container(
        ft.Stack(
            [
                ft.Image(
                    src="https://picsum.photos/200/300",
                    fit=ft.ImageFit.FILL,
                    width=float("inf"),
                ),
                cp,
            ]
        ),
        border_radius=5,
        width=float("inf"),
        expand=True,
    )
)

ft.app(main)

[FeodorFitsner]

You can draw endlessly now! :) Here's updated example: https://github.com/flet-dev/flet/blob/main/sdk/python/examples/controls/canvas/brush.py

[yst-one]

You can draw endlessly now! :) Here's updated example: https://github.com/flet-dev/flet/blob/main/sdk/python/examples/controls/canvas/brush.py你现在可以无休止地画画了！:)这是更新的示例：https://github.com/flet-dev/flet/blob/main/sdk/python/examples/controls/canvas/brush.py

Thanks for your hard work.