[Solved] You wrote this async Django view:async def cpu_task(request): result = heavy_calculation() return JsonResponse({'value': result})Why might this cause performance issues? | Django

Django - Async Django

You wrote this async Django view:

async def cpu_task(request):
    result = heavy_calculation()
    return JsonResponse({'value': result})

Why might this cause performance issues?

ABecause heavy_calculation() is synchronous and blocks the event loop

BBecause async views cannot return JsonResponse

CBecause async views must not have return statements

DBecause heavy_calculation() is awaited incorrectly

Step-by-Step Solution

Solution:

Step 1: Identify sync call inside async view
The function heavy_calculation() is synchronous and CPU-heavy, called without await.
Step 2: Understand impact on async event loop
This blocks the async event loop, preventing other tasks from running concurrently, hurting performance.
Final Answer:
Because heavy_calculation() is synchronous and blocks the event loop -> Option A
Quick Check:
Sync CPU work blocks async loop = B [OK]

Quick Trick: Sync CPU tasks block async event loop, causing lag [OK]

Common Mistakes:

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