Visit this post to view 60 Speed up topics – more than 60 quality speed up tools recommendations:
1. CHOOSE SPEED HOSTING (as basis for speed WordPress site)
2. PERFORM SITE ANALYSIS
3. INSTALL CACHING TOOLS
4. PERFORM WP DATABASE OPTIMIZATION
5. INSTALL LOADING OPTIMIZATION TOOLS
6. PERFORM IMAGES OPTIMIZATION

List of 60+ recommended WordPress Speed Up Tools and useful links

1. SPEED HOSTING – Basis for WordPress Speed Rocking
  1. SiteGround RECOMMENDED Hosting that cares about the speed of their clients’ sites and clients itself with which admin and creator of this Group has positive experiences and can vouch for it on the basis of the long personal experiences.
  2. Other Hostings: although it is very hard to find “unbiased” hosting reviews/experiences, these are as close as possible ones so you see what people say about various hostings on social networks. You can also choose some of the mentioned hostings with good comments/users’ experiences and give it a try:
2. SITE ANALYSIS:
Free Tools
  1. Pingdom: RECOMMENDED The web tool for complete site speed analysis
  2. GTmetrix: the web tool for complete site speed analysis
  3. WebPagetest: website performance and optimization test web tool
  4. Page Speed Grader: the web tool for complete site speed analysis
  5. Page Speed DotCom-Monitor: instantly test your website speed in real browsers from +20 locations worldwide
  6. Google PageSpeed: the PageSpeed family help you optimize the performance of your website
  7. WebWait: benchmark your website or test the speed of your web connection
  8. Page Load Time: RECOMMENDED Chrome extension for fast measuring page load time
  9. Pingdom DNS Health: RECOMMENDED check if its DNS servers are configured correctly for a domain name
  10. P3 Profiler: identifying plugins that are slowing down the site
  11. Query Monitor: database queries with times
  12. Debug Queries: list query-actions only for admins for debug purposes
  13. GOTMLS (Anti-Malware): RECOMMENDED Anti-Virus/Anti-Malware plugin in case of reduced site speed
  14. SUCURI: website Malware and Security Scanner in case of reduced site speed
Paid Tools
  1. MainWP (wih page speed extension): This extension seamlessly integrates with the Google Pagespeed Insights for WordPress plugin enabling you to monitor your child site performances directly from your MainWP Dashboard
  2. Load Impact: load testing tool
  3. Blitz.io: load testing tool
3. CACHING TOOLS:
Free Tools
  1. WP Super Cache: effective caching plugin
  2. Cache Enabler: a lightweight caching plugin for WordPress that makes your website faster by generating static HTML files plus WebP support
  3. Get CSS/JS files: debug tool for listing all CSS and JS files
Paid Tools
  1. WP Rocket: RECOMMENDED all-in-one and easy setup and powerful speed up plugin
4. WP DATABASE OPTIMIZATION:Free Tools
  1. WP Optimize: RECOMMENDED optimize WP database
  2. WP-Sweep: allows you to clean up unused, orphaned and duplicated data in your WordPress. It also optimizes your database tables
  3. WP-DBManager: optimize WP database
  4. Plugins Garbage Collector: RECOMMENDED cleaning up WP database
Paid Tools
  1. Smart Cleanup Tools: powerful plugin for database cleanup
  2. Smart Options Optimizer: unique plugin for tracing and removing unused options and meta records in the database
5. LOADING OPTIMIZATION:
Free Tools
  1. Plugin Organizer: RECOMMENDED changing plugins order loading and selectively disable plugins on chosen pages/posts
  2. a3 Lazy Load: speed up your site and enhance frontend user’s visual experience in PC’s, Tablets and mobile
  3. BJ Lazy Load: lazy loading for images
  4. Rocket Lazy Load: displays images on a page only when they are visible to the user
  5. Lazy Load for Videos: replace embedded Youtube and Vimeo videos with a clickable preview image
  6. WP YouTube Lyte: lazy load your videos, by inserting responsive “Lite YouTube Embeds”
  7. GIF Animation Preview: replace GIF animations to a static preview image
  8. Autoptimize: aggregating and minimizing JS, CSS and HTML
  9. WP User Avatar: RECOMMENDED use any image from your WordPress Media Library as a custom user avatar and speed up your site
  10. Social Media Feather: RECOMMENDED a super lightweight free social media WordPress plugin that allows you to quickly and painlessly add social sharing and following features to all your posts, pages and custom post types
  11. Crunchify Social Sharing: fastest & Simplest Social Sharing Button without any Java Script
  12. Simple Share Buttons: a simple and speedy plugin that enables you to add share buttons to all of your posts and/or pages
  13. Sharify: a simple, responsive and beautiful social sharing plugin for less server load and faster webpage loading
  14. Meta Slider: very popular WordPress slider plugin and extremely fast
  15. Heartbeat Control: RECOMMENDED easily manage the frequency of the WordPress heartbeat API thus speeding up your site’s admin dashboard
  16. Cloudinary: images in the cloud
  17. CloudFlare: supercharge your site speed through cloud
  18. WP-SpamShield Anti-Spam: this plugin has an extremely low overhead and won’t slow down your site, unlike some other anti-spam plugins.
Paid Tools
  1. MaxCDN: distribute content to make web pages and media load faster
  2. RackspaceCDN: distribute content to make web pages and media load faster
  3. KeyCDN: a simple, fast and reliable CDN
  4. WP Offload S3: offloading your media and assets to Amazon S3 & CloudFront
  5. Ultimate Social Deux: Ultimate Social Deux social sharing plugin won’t slow your site down
  6. Flow-Flow: premium social media plugin to display social feeds without slowing down your site
  7. Envira Gallery: a responsive and fast WordPress gallery plugin that creates incredibly simple and easy workflows around building and managing galleries in WordPress
6. IMAGES OPTIMIZATION:Free Tools
  1. Imagify: RECOMMENDED dramatically reduce image file sizes without loosing quality, make your website load faster, boost your SEO and save money on your bandwidth
  2. Imsanity: automatically resizes huge image uploads
  3. EWWW Image Optimizer: reduce file sizes for images
  4. Optimus: effective image compression and optimization during the upload process
  5. ImageRecycle pdf & image compression: pdf & image compression
  6. Compress JPEG & PNG images: optimize your JPEG and PNG images automatically with TinyPNG
  7. JPEGmini: a superb online tool for losing your images kilobytes
  8. Compressor.io: a powerful online tool for reducing drastically the size of your images and photos
  9. RIOT: RECOMMENDED optimizing images on PC
  10. FastStone: image editor (resizing and cropping), as well as image browser and converter
  11. ImageOptim: optimizes images on MAC
Paid Tools
  1. JPEGmini Pro: a superb online tool for losing your images kilobytes
  2. Kraken PRO: online optimizing images and accelerating your websites
USEFUL WP OPTIMIZATION ARTICLES:
  1. Speeding Up a WordPress Website on WPHUB
  2. The Ultimate Mega Guide to Speeding Up WordPress
  3. 11 ways to Speed Up WordPress
  4. Diagnose admin-ajax.php Causing Slow Load Times in WordPress
  5. Why you Shouldn’t Care About Google PageSpeed Insights