Searched & tried a lot: Is it Possible to Eliminate Render Blocking Manually

If you want to defer loading of css, see CSS delivery optimization: How to defer css loading?.

If you want to defer loading of js, you can use this:

add_filter( 'script_loader_tag', function( $tag, $handle ) {
  return str_replace( "<script type="text/javascript"", 
    "<script type="text/javascript" defer="defer"", $tag );
}, 10, 2 );

Related Posts:

  1. Improving the perfomance of a plugin action
  2. Do deactivated plugins slow down a WordPress site?
  3. How to export comments in WordPress?
  4. How can I call a function from one plugin within another plugin?
  5. Gutenberg disallow certain custom blocks but keep all core blocks?
  6. Remote upload file to server B
  7. Publish author posts only with editor approval?
  8. Using functions from a plugin in your theme
  9. Keep one user logged for a year?
  10. Customizing subject in comment notification e-mails
  11. WP showing “warning: call_user_func_array()”, What to do?
  12. Declare a function before plugin does on the theme functions.php file
  13. Generate Advanced Custom Fields box in custom admin menu page
  14. How to turn off email you receive when registered?
  15. Removing user contact methods works from functions.php but not from a plugin
  16. Execute a function using ajax
  17. Use functionality of 2 wordpress plugins
  18. How can i change an image’s author?
  19. Converting a simple plugin to be placed inside of functions.php
  20. Set WordPress Featured Image For All Post Slugs Matching Image File Name in Specified Directory
  21. Showing Co-Authors on post page
  22. jQuery Plugin to use WordPress functions in AJAX request
  23. greatest() function returns undefined property
  24. Debugging Technique Question re: functions.php
  25. The Point of Using apply_filters()
  26. WP Job Manager Category Drop-down; Change Placeholder Text Via Filter
  27. How to get subscription key or id using Woocommerce Subscriptions [closed]
  28. How to include code into functions.php file via a plugin
  29. Custom Taxonomy Tag Search
  30. Redeclare theme’s function in a plugin
  31. I have functions in my wordpress plugin. How do I get them to work for me?
  32. Change wordpress current_time function to different timezone
  33. How to override a plugin function wrapped in a class?
  34. Edit Yoast SEO breadcrumbs output [closed]
  35. Snippets: is it better to add them in functions.php or make site-specific plugins?
  36. Using a post-signup hook to get user details
  37. Restrict media upload size by format
  38. Calling plugin function inside custom plugin for onclick event
  39. Show function to super admin
  40. Will Gutenberg Have a Negative Impact on Page Speed?
  41. Facebook Messager Plugin
  42. All sites themes functions.php have been changed
  43. Plugin is a widget, but I want to call it in the head, can I?
  44. Cannot get wpdb data (Error in a simple fuction) [closed]
  45. What are the performance hiccups when building plugins?
  46. Basics of changing plugin output
  47. Why can’t I call a (member) function from within a foreach?
  48. Are there action hooks for comments?
  49. Help with WP Business Directory Manager Plugin?
  50. Shortcode Attributes to Return different $_POST
  51. Plugin onclick button activate other plugin
  52. Loading a plugin’s js file from functions.php
  53. Activate and deactivate plugin automatically
  54. dynamic name of the style for wp_enqueue_style
  55. WordPress function to add text warning on every pages [closed]
  56. How to access OOP plugin function inside themes or other plugin
  57. Different registration form for different roles
  58. Call javascript functions from each page
  59. Add_image_size not generating correct size
  60. Elementor Pro display featured image on section -> style -> image using shortcode
  61. How can i call a functions.php function, from inside my plugin class?
  62. How to make WooCommerce payment method field optional?
  63. Create a pdf from the entries in DB
  64. RSS feeds for specific topics
  65. WordPress Custom Hook with Class method
  66. Allow a particular user to access a particular plugin?
  67. How to remove Unused CSS From a WordPress Theme?
  68. how to define a html folder to make it work with WordPress commands
  69. add a hook of Woocommerce to a plugin but it only shows and doesn’t function properly
  70. ACF Fields are not showing up on Homepage
  71. Adding discount functionality to the cart
  72. Use buddypress function outside of plugin
  73. Securing langugae folder
  74. WPML – Hook when language is switched (change user language)
  75. Call function with button and return response
  76. Use action, filter, or hook to append HTML to WordPress plugin function
  77. Return function results within shortcode
  78. Save Post Permalink In .txt File
  79. Why is WP template_include overwritting all templates rather than specified page?
  80. How To Add Code To WP Without Plugin or Functions
  81. Disqus comments count taking long to update
  82. plugin not hooking to my custom hook
  83. Populate select option with JSON file
  84. Home page letters
  85. Find all strings between an enclosing shortcode
  86. API calls on plugin activation or init?
  87. Load wordpress enviroment for external content?
  88. How to structure plugin in to functions?
  89. Trying to output a “Most visited blogs” list in wordpress multisite
  90. How to disable register and reset the password from WordPress admin panel?
  91. wordpress Search function is not working
  92. What is wrong with this dbDelta syntax?
  93. Call a function with href
  94. Eliminate Render blocking CSS?
  95. Adding a script & php to functions.php
  96. PHP Creating a formula from mysql db values and db stored math operator
  97. Make plugin admin page visible to other roles
  98. Sort posts by Date (DESC) and by ACF: active_inactive (ASC)
  99. wp_enqueue_script doesn’t load JS in plugin
  100. How can i store cache of wordpress a database request without plugins?