very slow in py file and how to close/open autocomplete in file temporary?

python3.9 , vim 8.2 (mac), the newest "vim-easycomplete".

Below this is my import , and my project about 30 files.

"
import os
import requests
import time
import timeit
import random
import re
from multiprocessing.dummy import Pool
import csv
import json
import sys
import base64
import getopt
import pytz
import datetime
"

A few minutes after open file, very slow when I type any character, sometime it will pause several seconds and than show all typed characters suddenly. Again and again, can't use.

So I want know why this happen, am I setting wrong or that was something wrong, could I close it temporary?

Reproduce the typing delay in the reported Python file using Vim 8.2 on macOS, the newest vim-easycomplete, and the listed imports. Investigate whether the project size or completion behavior triggers the pauses, and document the cause plus a reliable temporary close/open procedure as the done criteria.

Written by the indexing model from the issue text.