Extreme lag while developing using Mac OS - macos

Question

Im working on Mac Book Pro, OS : Catalina 10.15.7.
At first I was using VS Code to develop in Go but the ( fan?? ) i guess started sounding like a turbo Jet after a while up to the point that the entire OS would shutdown on its own. ( I do not exactly recall what the message said, it was a black screen with white text saying something like your cpu utilization was too high etc, etc and we had to restart the system ).
Today I am trying to run this Python3 script :
#!/usr/local/bin/python3
import csv
import json
import boto3
import time
from multiprocessing import Pool
dynamodb = boto3.resource('dynamodb', endpoint_url='http://localhost:4566', region_name='us-east-2')
table = dynamodb.Table('myTable')
collection = []
count = 0
with open('items.csv', newline='') as f:
reader = csv.DictReader(f)
for row in reader:
obj = {}
collection.append({
"PK" : int(row['id']),
"SK" : "product",
"Name" : row['name']
})
def InsertItem(i):
table.put_item(Item=i)
if __name__ == '__main__':
with Pool(processes=25) as pool:
result = pool.map(InsertItem, collection, 50)
print(result)
And the same behavior occurs ( it does not seem to be related to VS Code now since im directly running this script from the terminal ), the fans are extremely noisy, the performance drops to almost 0 and i get the lollypop mouse pointer of death. ( which seems to be an omen of the PC about to restart itself ) and the process I mentioned above happens again.
Some hints of what is going on :
Im not the only one having this problem. Another teammate does React and is seeing the same behaviour. ( Hs is using VsCode too but I think the problem is more generic ).
It seems to appear only with "intensive" tasks. ( And please take "intensive" with a grain of salt. I do the very same tasks in my Ubuntu Machine with half the RAM and it does not even flinch ).
I have been using Mac for years, and I do not recall having this issue.
So, my question is, is someone else noticing something similar? Is there some workaround for this?
Last note: The python script you see above I tested last week, it did not take even 2 minutes to run. today with these issues its just lingers forever. And I can see for the prints I am doing that it attempts to insert stuff but it freezes without moving forward.