Hello everyone on the internet! I am making a stock prediction model in python and tkinter but I have trouble with No responding Python when I try to search ‘a’ on on the combo box widget. The combobox has an autofill function and it contains a list of names of stocks the list size is 3971 lines long. No response python

here is my code:

# import gui
import tkinter as tk
from tkinter import ttk
import pandas as pd

def start_win():
    # create instance
    win = tk.Tk()
    # title name
    win.title("test")
    # resizable option
    win.resizable(True, True)
    # window size
    win.geometry("375x315")

    top_frame = ttk.LabelFrame(win, text='')
    top_frame.grid(column=0, row=0, padx=10, pady=10)
    
    # import csv
    csv = pd.read_csv('stocks.csv')

    stock_names = csv['Name'].tolist()
    stock_names.append('Other')
    ttk.Label(top_frame, text='Search Stocks: ').grid(column=0, row=0)
    # combo box
    stocks_var = tk.StringVar()
    stocks = ttk.Combobox(top_frame, width=10, textvariable=stocks_var)
    stocks['values'] = stock_names
    #stocks['values'] = ('other')
    stocks.grid(column=1, row=0)
    stocks.current(0)

    def search(e):
        value = stocks.get()
        print(value)
        if value == '':
            stocks['values'] = stock_names
        else:
            data = []
            for i in stock_names:
                if value.lower() in i.lower():
                    data.append(i)
                stocks['values'] = data

    win.bind('<KeyRelease>', search)

    # start GUI
    win.mainloop()

#sub button func
def sub_button_func():
    sub.quit()
    sub.destroy()
    start_win()
    exit()

#sub button
sub_button = ttk.Button(sub, text='OK', command=sub_button_func)
sub_button.grid(column=0, row=2)

sub.mainloop()

I think the problem of it is because of the large list and I think it can be solved by numpy

Thank you for your help!