Improving page speed score in Google Page Score test- PART2

In our previous blog post, we got an idea of what are the things that Google's Page Speed Insights will take into the count to give page score, now in the present blog post we'll get to know what are the techniques we can use to improve the page score.

1. Reducing the Server response time:

As a programmer, one of the reasons of the high server response time is due to redundancy in the queries. The following the cases where we use redundancy of queries and how can we reduce them.

We use .exists() method, while querying to check if the DB object exists or not. Suppose we are having a model called 'Assessment'. The following is a code snippet with the wrong usage of .exists().
```
if Assessment.objects.filter(id=assess.assessment_id, edu_class_id=role.edu_class_id, subject_id=role.subject_id).exists():
     assessments_list = assessments_list + list(Assessment.objects.filter(id=assess.assessment_id,edu_class_id=role.edu_class_id,subject_id=role.subject_id))
```
In the above code the query 'Assessment.objects.filter(id=assess.assessment_id, edu_class_id=role.edu_class_id, subject_id=role.subject_id)' is repeated twice. Using the same query second time is of no use. The method .exists(), is to be used in such cases where the query set result is not used anywhere else. We can rewrite the above code as below.
```
assessments = Assessment.objects.filter(id=assess.assessment_id, edu_class_id=role.edu_class_id, subject_id=role.subject_id)
if assessments:
     assessments_list = assessments_list + list(assessments)
```
Similarly, we can use two querying methods prefectch_related() and select_related() to reduce redundancy of queries. For more about prefectch_related() and select_related(), check https://docs.djangoproject.com/en/1.8/ref/models/querysets/
We can use caching the query set data, to not query for the DB again and again if there is a large amount of data. For caching we can use Django-Memcached. For further details of Django-Memcached check https://docs.djangoproject.com/en/1.8/topics/cache/.
For further compression, we can enable gzip compression in the servers.

2. Enable compression and minifying CSS and JS:

Many of the projects which are developed in Django use a plugin called 'Django-Compressor' to compress the CSS and JS resources. For more information about Django-Compressor check http://django-compressor.readthedocs.org/en/latest/. By default, django compressor won't minify the CSS and JS files completely. To minify CSS and JS resources we have to keep the following settings in settings.py

COMPRESS_CSS_FILTERS = ['compressor.filters.css_default.CssAbsoluteFilter','compressor.filters.cssmin.CSSMinFilter']
COMPRESS_JS_FILTERS = ['compressor.filters.jsmin.JSMinFilter']

3. Minify HTML:

Django supports multiple HTML minification techniques, two of them are Django-htmlmin and Django-hmin. Both will minify the HTML data that is going to be loaded on the page. For more about Django-htmlmin check https://pypi.python.org/pypi/django-htmlmin and for django-hmin check https://pypi.python.org/pypi/django-hmin/0.3.2

4. Leverage browser caching:

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network. If we are landing the static files using Nginx the need the configure the expires value in the Nginx configuration file. This will look as following.

expires 365d;

If we use Django-storages we have to keep the following settings in your settings.py.

AWS_HEADERS = {
    'Expires': 'Thu, 15 Apr 2010 20:00:00 GMT',
    'Cache-Control': 'max-age=86400',
}

This setting sets an expiry date for the resources those are being served from AmazonS3.

By following the above techniques we can render our page more quickly, such that it will increase the page score in the google page speed insights.

Posted On 30 July 2015 By MicroPyramid

Previous post Next post

Need any Help in your Project?Let's Talk

Latest Comments

OUR SERVICES

OPEN SOURCE PACKAGES

Django-CRM :Customer relationship management based on Django

Django-blog-it : django blog with complete customization and ready to use with one click installer Edit

Django-webpacker : A django compressor tool

Django-MFA : Multi Factor Authentication

Docker-box : Web Interface to manage full blown docker containers and images

More...

Improving page speed score in Google Page Score test- PART2

1. Reducing the Server response time:

2. Enable compression and minifying CSS and JS:

3. Minify HTML:

4. Leverage browser caching:

Need any Help in your Project?Let's Talk

Is Django best framework for your web application development

How to maintain user session across sub domains in Django

What is Django CRM and it’s advantages

Implementation of single sign on using auth0 in django application

Customizing Django REST API Serializers

How to implement TokenBasedAuthentication in DjangoRestFramework?

Understanding middleware functionality in django2.0

Django acceptance testing automation with robot framework

How to filter a Django Queryset using Extra

how to pass extra context data to serializers in django-rest-framework ?

Overriding Django Model behaviour with Proxy Model

Understanding Routers in Django-Rest-Framework

Django Single Sign On(SSO) to multiple applications

How to Document API Requests using Django Rest Swagger

Django webpacker - A compression tool to bundles css, js files

What's great about Django girls to inspire women into programming

How to use nested formsets in django

How to convert xml content into json using xmltodict

Custom validations for serializer fields Django Rest Framework

How To Add A Custom Managers In Django

Introduction to API development using Django REST framework with Example

Django-REST Framework Object Level Permissions and User Level Permissions

Using Python weasyprint generate HTML to PDF in django

How to create thumbnail image in Django templates using sorl-thumbnail?

Deploying Your Django app on Heroku

Django Template language Intro

Using Gitlab API, integrating gitlab in django project for authentication and access

Sorl-thumbnail to generate thumbnails in django

Django Conditional Expressions in Queries

Querying with Django Q objects

How to Create initial django migrations for existing DB schema.

Integration Of GitHub API with python django

Django Unit Test cases with Forms and Views

Django - Database access optimization

How To Write Custom migrations in Django

Dynamically Adding Google Maps with Marker In Django

Django - migrating from function based views to class based views

Integration Of Linkedin API in python django

Understanding Checkout flow in Django Oscar.

Django efficient implementation of Amazon s3 and Cloudfront CDN for faster loading.

How to monitor django application live events with sentry

How to create Custom User Model or Extend User Model in Django?

Working with Django Plugins

Export html web page to pdf using jspdf

Preserve file names with sorl for better SEO

Custom Password Less Authentication in Django

Improving page speed score in Google Page Score test- PART2

Extract text with OCR for all image types in python using pytesseract

Factory Boy - An alternative for Fixtures

Improving page speed score in Google Page Score test- PART1

Integration of 2checkout with django

Get count, average, min, max values from model field using Django Aggregate

Set Up Travis CI For Django project

Sending emails using sendgrid on heroku for a Django App

Django Custom Template Tags And Filters

Python Memcached Implementation for Django project

How to customize Django Oscar Models, Views and URL's

Integrate Django-Oscar-Accounts with Django-Oscar

Google plus API integration with django

Extract data from PDF and all Microsoft Office files in python

django Payu Payment gateway Integration

Running Django with PyPy to boost performance

How to Create your own e-commerce shop using Django-Oscar.

Setting Up Coveralls for Django Project

Sendgrid Inbound Email Parsing with django

How to customize the admin actions in list pages of Django admin?

Handling Custom Error Pages(404, 500) In Django

Autocomplete with Django-Haystack and Elasticsearch with single letter querying.

How to create Periodic Tasks with Django Celery?

Best Practices of Using Django Celery in Django Social Auth

Custom Decorators To Check User Roles And Permissions In Django

Implement search with Django-haystack and Elasticsearch Part-1

How to index binary files in django haystack

Understanding django serializers with examples