Good evening.

I am working on an application with PyQt. A colleague shared the following instruction self.shadow.BlurHint(QGraphicsBlurEffect.PerformanceHint) . This is to improve the performance of the application when executing the Blur effect.

How can I check that it works?

Here I leave the code that I have done so far. and as a question, How I can move the position of the DropShadow effect , that is to say so that it is on the side of the main window.

Code:

import sys
from PyQt5.QtWidgets import QMainWindow, QApplication ,QLabel, QGraphicsEffect, QVBoxLayout, QGraphicsDropShadowEffect, QGraphicsBlurEffect
from PyQt5 import uic
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5 import QtGui

class Pinricpal(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)

        self.resize(600,400)
        self.shadow = QGraphicsBlurEffect(self) #Efecto blur
        self.shadow.setBlurRadius(25)
        self.shadow.BlurHint(QGraphicsBlurEffect.PerformanceHint) #Instrucción que desconozco su funcionamiento 

        self.setWindowFlags(Qt.FramelessWindowHint)
        self.setAttribute(Qt.WA_NoSystemBackground, True)
        self.setAttribute(Qt.WA_TranslucentBackground, True)

        self.sombra = QGraphicsDropShadowEffect() #Efecto de Sombra al que deseo cambiar la posición. 
        self.sombra.setBlurRadius(12)
        self.sombra.setColor(QColor(33,0,248))
        self.sombra.setOffset(2,2)

        self.setGraphicsEffect(self.shadow)
        self.setGraphicsEffect(self.sombra)

    def paintEvent(self, event=None):
        painter = QPainter(self)

        painter.setOpacity(0.7)
        painter.setBrush(QColor(168,34,3))
        painter.setPen(QColor(168,34,3))
        painter.drawRect(self.rect())

    def mousePressEvent(self,event):
        if event.button() == Qt.LeftButton:
            self.dragPosition = event.globalPos() - self.frameGeometry().topLeft()

    def mouseMoveEvent(self,event):
        if event.buttons() == Qt.LeftButton:
            self.move(event.globalPos() - self.dragPosition)


app = QApplication([])
principal = Pinricpal()
principal.show()
app.exec_()