python opencv实时流非常慢

我在raspberry pi上写了一个直播脚本，主要问题是结果流有延迟，而且速度非常慢。我真的不知道如何加快这个过程，请帮忙

这是我的密码：

import cv2
import numpy as np

cap = cv2.VideoCapture(0)
gray_flag=True
cliplimit = 1

def clahe():

    global frame
    clahe = cv2.createCLAHE(cliplimit, tileGridSize=(8,8))  
    lab = cv2.cvtColor(frame, cv2.COLOR_BGR2LAB) 
    l, a, b = cv2.split(lab)  
    l2 = clahe.apply(l)  
    lab = cv2.merge((l2,a,b))  
    frame = cv2.cvtColor(lab, cv2.COLOR_LAB2BGR)

while True:
    was_pressed = False
    ret, frame = cap.read()

    clahe()
    gray=cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    
    c = cv2.waitKey(1)
    if c & 0xFF == ord('q'):
        break
    elif c & 0xFF == ord('h'):
        if not gray_flag:
            gray_flag = True        
        else:
            gray_flag = False
    elif c & 0xFF == ord('d'):
        if not was_pressed:
            if cliplimit == 1:
                cliplimit = 20
            elif cliplimit == 20:
                cliplimit= 1
            was_pressed = True
    if gray_flag:
        cv2.imshow('screen', gray)
    else:
        cv2.imshow('screen', frame)

cap.release()
cv2.destroyAllWindows()

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上面的脚本对我来说很好，速度也很快。。我想你可能需要增加你的电脑内存