Python 如何避免 Tkinter 随着形状数量的增加而变慢

我有一个巨 Python 项目与tkinter.在这个项目上，我随着时间的推移画出了小方块. 我注意到随着正方形数量的增加，tkinter的速度变慢了.

下面是一个简单的例子，它在每次迭代中绘制200个红色方块:

import tkinter as tk
import random
import time

WIDTH = 900
CELL_SIZE = 2
GRID_WIDTH = int(WIDTH / CELL_SIZE)
CELL_PER_ITERATION = 200
SLEEP_MS = 50


root = tk.Tk()
canvas = tk.Canvas(root, width=WIDTH, height=WIDTH, bg="black")
canvas.pack()

current_iteration = 0
cell_count = 0
previous_iteration_end = time.time()

text = tk.Label(root, text=f"iteration {current_iteration}")
text.pack()


def draw_cell(x_grid, y_grid):
    x = x_grid * CELL_SIZE
    y = y_grid * CELL_SIZE
    canvas.create_rectangle(x, y, x + CELL_SIZE, y + CELL_SIZE, fill="red")


def iteration():
    global current_iteration
    global previous_iteration_end
    global cell_count

    current_iteration_start = time.time()

    for _ in range(CELL_PER_ITERATION):
        draw_cell(
            x_grid=random.randint(0, GRID_WIDTH),
            y_grid=random.randint(0, GRID_WIDTH),
        )
        cell_count += 1

    current_iteration_end = time.time()

    # duration of this iteration
    current_iteration_duration = current_iteration_end - current_iteration_start

    # duration between start of this iteration and end of previous iteration
    between_iteration_duration = current_iteration_start - previous_iteration_end

    current_iteration += 1

    text.config(text=f"iteration {current_iteration} | cell_count: {cell_count} | iter duration: {int(current_iteration_duration*1000)} ms | between iter duration: {int(between_iteration_duration*1000)} ms")

    previous_iteration_end = current_iteration_end


def main_loop():
    iteration()
    root.after(ms=SLEEP_MS, func=main_loop)


root.after(func=main_loop, ms=SLEEP_MS)
root.mainloop()

Which gives (time data is written at the bottom of picture):

And after a few seconds:

因此，执行迭代的时间保持不变.但在两次迭代之间，持续时间会随着时间的推移而不断增加.我不明白特金特为什么放慢了脚步.

Is it redrawing the entire canvas (so all already drawn squares) at each iteration ? Is there a way to avoid this slow down ?个

Note: This is an example, the real project i am working on looks like this: 100