Use this middleware for Django to append the load time to each page. Add it to the middleware config in your settings.py file. If you wish to disable it for a given view, use the @PageLoadExempt decorator.

pageLoadMiddleware.py

from django.utils.decorators import decorator_from_middleware, available_attrs
from functools import wraps
import time

class PageLoadTimerMiddleware:
    def __init__(self):
        self.initTime = time.clock()
        self.disabled = False
    
    def process_request(self, request):
        self.requestTime = time.clock()
    
    def process_response(self, request, response):
        if self.disabled:
            return response
        responseTime = time.clock()
        timeDiff = responseTime - self.initTime
        response.content += "<br/>Elapsed time: %1.2f seconds." % (timeDiff)
        return response
    
    def process_view(self, request, view_func, view_args, view_kwargs):
        if getattr(view_func, 'pageLoadExempt', False):
            self.disabled = True
            return None

def PageLoadExempt(view_func):
    def wrapped_view(*args, **kwargs):
        return view_func(*args, **kwargs)
    wrapped_view.pageLoadExempt = True
    return wraps(view_func, assigned=available_attrs(view_func))(wrapped_view)