Could a higher number of registered image sizes affect performance?

Depends. One argument could be that if the requested page use all sizes then there will be a lot of image calls (slower response, bandwidth etc) but you can bypass that i.e. by loading images with JS. Also more sizes means more disk space usage. I don’t think there is any significant performance concern related to back-end, meaning the db calls / queries etc.

Also if the images are compressed from the begging a few pixels down in width or height won’t be a difference in performance.

You can have an image with 600×900 dimension and cover a lot of intermediate sizes adjusting with CSS and keep a good aspect ratio and have a good quality for retina monitors. Better to have a bigger, in dimension, image and shrink it than to have a smaller image and scale it up.

Related Posts:

  1. Steps to optimize WordPress in regard to server load and website speed?
  2. Website is slow: advice on optimization
  3. Speeding Up Bulk Post Creation – wp_insert_post & update_post_meta
  4. How to properly insert a stylesheet in wp_head
  5. Using Multiple Queries of “home_url” vs. Calling a Variable Multiple Times
  6. Page taking time in loading. Also used lazy loading but doesn’t work?
  7. Optimizing site speed by localizing paths
  8. get_the_id, get_the_permalink, and get_the_title all with one DB call
  9. High traffic management in WP
  10. wp_get_attachment_image_src() regenerate custom size images everytime
  11. admin.php taking 14 seconds
  12. How to optimize recaptcha__en.js
  13. How can I optimize my website for improved speed? [closed]
  14. Measure the time it takes to execute a t-sql query
  15. How can you profile a Python script?
  16. How well does WordPress scale?
  17. What are the best practices for using a caching plugin on a shared host?
  18. What’s the difference between wp_insert_user() and wp_create_user()
  19. How to fix wordpress slow first time load (Local Server)?
  20. What’s the ideal way to profile WordPress memory usage?
  21. WordPress SLOW, tried everything!
  22. WordPress so slow to load on MAMP
  23. get_adjacent_post alternative on a very large db
  24. Refresh external feeds only in cron?
  25. What is the proper use of https in a modern E-Commerce environment?
  26. Any reason why wp_cache_set not to work?
  27. What are best practices for configuring a server for WordPress sites?
  28. In terms of performance – Is unmanaged VPS better than a managed one – for WP sites?
  29. Utilize WordPress Authentication Only
  30. How can WordPress be made more memory efficient?
  31. WordPress tries to load “next page” after done loading current page
  32. WordPress speed slow after .5 million single image post via wp-cli
  33. Localization / textdomain is slow and chaotic
  34. Defer Code in Widgets – Page Speed
  35. WordPress performance issue. Can I debug it?
  36. Image sizes and order of operations
  37. How much will mounting wp-content on a separate NFS server impact performance?
  38. What other plugins are there available to track app performance for wordpress?
  39. WordPress Meta description – is it better to use manual configuration?
  40. Removing translation textdomain
  41. WordPress site is sloooow, but admin is fast….any ideas?
  42. Do I manually minify css code in my main theme or child theme?
  43. Is post_class(); going to slow WordPress page speed
  44. cross-host benchmarking with wordpress
  45. Performance problem with first load
  46. I’m designing a plugin to create database indexes. Suggestions?
  47. WP Responsive images – upload custom image sizes
  48. Does using WP-cron make the site slower for the user?
  49. How to preload images through Code Snippets wp_head for specific pages?
  50. TTFB increased for no reason
  51. Improve performance by removing unnecessary database queries
  52. Can the page load time depend on incidence of visiting?
  53. Preload Cache for thousands of posts may be on non-production environment
  54. Is it possible to make WordPress PHP faster through caching or compiling it?
  55. W3 Total Cache: use cache for request with ignorable query string [closed]
  56. How to optimize on-the-fly theme switching for mobile browsers?
  57. Wordress importing scripts
  58. Server Hardware for WordPress [closed]
  59. WordPress network vs Separate installs
  60. How to test site speed?
  61. Optimizing function that automatically creates internal links based on post title string
  62. Optimising uploads folder then re-uploading?
  63. Performance testing a WordPress site locally?
  64. wordpress extremely slow on NAS
  65. Minifing js files with w3 total cache and expiring the combined file [closed]
  66. My authors need to be able to preview their upload images and manipulate and scale
  67. Does fixing PHP notices improves website performance?
  68. How do you make a site load faster when offloading is not an option?
  69. Optimal image size for wordpress?
  70. Lazy Loading of all Images
  71. how to embed Pdf and Video Without effecting page speed?
  72. Slow issues with Website running WordPress on Azure
  73. WordPress is very slow, even it’s not opening sometimes
  74. Write/saved logs in WordPress
  75. Best way of coding a theme with multiple languages in WordPress
  76. What is the best way to host a site with many images without it being too slow?
  77. How fast can I expect WordPress to be on a fresh install locally?
  78. Change loading order of blocks
  79. get_template_part calls amount and performance?
  80. Can lots of tags affect performance?
  81. REST api v2 how can modify respond types and make custom DTO for better performance
  82. Performance of wp_get_attachment_image_srcset() and wp_get_attachment_image_url()
  83. Optimising amount of calls to custom fields
  84. Why is the server response time slowing my site down? [closed]
  85. High I/O load when hosting lots of wordpress sites
  86. How to handle high load of traffic of my server
  87. How to preload the entire site with javascript?
  88. How we can reduce wordpress page loading time? [closed]
  89. How to Aggregate, minify and compress (AMC) static and dynamic resources?
  90. How to improve my site’s loading time?
  91. WordPress and TTFB (time to first byte) stats
  92. What’s a good tool for speed benchmarking? [closed]
  93. How can we remove “unused”/no long used calls when loading the homepage?
  94. What kind of data that 3rd part dependencies using?
  95. Are networks now faster than disks?
  96. High load average, low CPU usage – why?
  97. Very long initial loading (20sec)
  98. Is is possible to append .webp to srcset images using wp_filter_content_tags()?
  99. Could a very long article slow down all website and wpadmin?
  100. Identifying Issues in Pagespeed Insights: Server Response Time and Long Main Thread Tasks