2.3.3
Release Date - April 10, 2025

• improved: styling and wording of Slim rules, plus additional documentation
• fixed: parsing of Slim rules with wildcards does not behave as expected
• fixed: PHP warnings due to race conditions while clearing cache

2.3.2
Release Date - February 12, 2025

• fixed: sub-folder sites cannot generate Critical CSS
• fixed: PHP error when adding Slim rules to disable, defer, or delay JS/CSS

2.3.1
Release Date - December 18, 2024

• changed: Critical CSS auto refresh after post/page updates is optional

2.3.0
Release Date - November 7, 2024

• added: store errors from Critical CSS generation for future reference
• changed: Critical CSS generation included with SWIS license (beta)

2.2.2
Release Date - October 24, 2024

• fixed: post-enqueue JS/CSS parser uses incorrect handles
• fixed: some JS variable definitions not excluded from JS defer

2.2.1
Release Date - October 10, 2024

• fixed: CDATA exclusion for inline JS defer was too aggressive
• fixed: is_file() wrapper method triggers PHP warning on empty path
• fixed: caching system not fully removed after disabling page caching
• fixed: WP_CACHE constant sometimes not detected after enabling page caching

2.2.0
Release Date - August 15, 2024

• added: self-host Google Fonts for improved privacy and completely eliminate extra DNS/HTTP requests
• added: Google Fonts optimized in stylesheets where fonts are mixed with additional CSS
• added: non-enqueued Google Fonts can be managed and disabled with Slim

2.1.4

Release Date - July 31, 2024

• changed: improved performance of is_file() wrapper method(s)
• fixed: errors when clearing server caches due to namespace resolution

2.1.3

Release Date - July 25, 2024

• changed: ensure SWIS front-end options are autoloaded in WP 6.6
• fixed: Help links broken in Firefox's Strict mode
• fixed: undefined variable affecting AMP output

2.1.2

Release Date - April 11, 2024

• added: compatibility with Slider Revolution 7 rendering engine
• changed: home page cache is automatically purged when updating a post/page
• improved: detection for login page in Critical CSS function

2.1.1

Release Date - December 20, 2023

• fixed: disabling cache clear on plugin upgrade (via override) does not pre-empt all cache clearing
• fixed: compatibility with X/Pro themes and Cornerstone builder
• fixed: PHP notices when cache settings file is outdated

2.1.0

Release Date - August 31, 2023

• added: dns-prefetch and preconnect hints for Bunny Fonts
• added: WPML support for Page Cache and Critical CSS
• added: Optimize CSS preloads WPBakery, Visual Composer, and Zion Builder CSS
• added: override for CDN domain via SWIS_CDN_DOMAIN constant
• changed: updated JS/CSS Minify library
• fixed: cache engine throws preg_grep() error on multi-site sub-domain installs in rare cases
• fixed: on multisite, database table upgrades may not run prior to cache preload and other background processes
• fixed: some front-end functions produce AMP validation errors
• fixed: Optimize JS breaks some inline scrips when they contain comments
• fixed: PHP 8.1/8.2 deprecation notices
• security: randomize filename of debug log

2.0.4

Release Date - July 19, 2023

• added: dns-prefetch and preconnect hints for CSS resources
• changed: dashicons not disabled by Slim if WP admin bar is visible
• fixed: PHP 8.1 deprecation notices from usage of add_submenu_page and add_query_arg
• fixed: PHP notice when getting cache size on disk
• fixed: preconnect hints (incorrectly) skipped if dns-prefetch hint exists
• fixed: guest asset check fails in some cases
• fixed: Slim displays duplicate dependency information
• fixed: Slim missing id attributes for form elements

2.0.3

Release Date - December 21, 2022

• changed: improved Brizy Builder compatibility
• changed: exclude .build.* files from minification
• fixed: prevent JS/CSS Minify from breaking on assets generated via admin-ajax.php
• fixed: front-end Critical CSS generation broken with JS error

2.0.2

Release Date - November 16, 2022

• fixed: AffiliateWP JS broken when inline scripts are deferred
• fixed: CDN rewriting leaks into some image URLs when Easy IO is active
• fixed: CDN rewriting leaks into post editor
• fixed: Thrive quiz builder broken with SWIS minify/defer
• fixed: PHP warnings generated during theme update

2.0.1

Release Date - November 8, 2022

• changed: use defer safe mode for jQuery when inline scripts are not deferred
• fixed: inline JS for Real Cookie Banner breaks when deferred
• fixed: inline data script elements broken by JS defer
• fixed: inline script elements with reserved characters malformed
• fixed: slim.js throws errors on wp-admin
• fixed: Slim front-end panel breaks if jQuery is loaded late using non-standard hooks

2.0.0

Release Date - October 27, 2022

• added: customize JS/CSS defer per-page via the Slim front-end panel (Manage JS/CSS)
• added: delay JS per-script and per-page via Slim front-end panel
• added: defer or delay inline scripts
• added: disable, defer, and delay scripts that do not use the standard enqueue system
• added: Test Mode to limit JS/CSS optimizations and Slim rules to logged-in admins
• added: JS errors indicated on Slim panel
• changed: if JS files are deferred, inline scripts will also be deferred by default
• changed: hide assets from Slim that are not used for non-logged in visitors

1.7.1

• changed: updated Easy Digital Downloads cookies excluded from caching
• fixed: PHP warning during activation when checking for settings change
• fixed: critical CSS function attempting array to string conversion

1.7.0

• added: manual Clear Site Cache action purges server-based caches: WP object cache, WP Engine, SiteGround, Pagely, LiteSpeed, and SpinupWP
• changed: add data-no-defer to critical css control JS
• changed: critical CSS for individual pages can be removed by clearing existing CSS and saving
• changed: Easy Digital Downloads cookies added to default cache exclusions
• fixed: stdClass "not found" in EDD updater file in edge cases
• fixed: HTML parsers break Bricks front-end editor

1.6.1

• updated: plugin updater class with ability for auto-updates
• changed: page cache can be enabled on any host in conjunction with server-based page caching
• fixed: get_plugin_data function undefined in some cases
• fixed: .htaccess admin notice shown on servers where it does not exist (and is not needed)
• fixed: cache engine debug function throws error in some edge cases
• fixed: PHP empty needle error in caching function

1.6.0

• added: CriticalCSS.com integration to generate critical CSS automatically and avoid FOUC with deferred CSS
• added: cache size and clear cache button on settings page
• changed: cache preload status auto-refreshes when running in background
• changed: cache overrides take effect without toggling cache setting
• fixed: page cache upgrade routine installs advanced-cache.php incorrectly
• fixed: undefined constant notice during page cache upgrade
• fixed: undefined variable when getting cache size
• fixed: cache exclusions not saving properly
• fixed: front-end checks not detecting feeds, embeds, and previews

1.5.4

• added: configure content directory with SWIS_CONTENT_DIR
• changed: make all permissions checks filterable
• fixed: removal of dashicons CSS breaks Ninja Forms
• fixed: unaltered CSS was pre-loaded twice
• fixed: fatal error for invalid class when mobile caching enabled
• fixed: JS errors when WP admin bar is hidden
• fixed: spaces in Slim rules prevent URL matches
• fixed: conflicts with Thrive Editor

1.5.3

• fixed: newer versions of Avada/Fusion builder not detected properly
• fixed: some functions of Customizer not working with deferred JS

1.5.2

• fixed: CSS defer double-parses the fallback noscript tags
• fixed: cache preload triggered by cache clear during plugin deactivation
• fixed: HTML parsing code incorrectly handles JSON markup

1.5.1

• added: preload CSS for Avada, Brizy Builder, Gutenberg plugin, and TagDiv Composer
• fixed: JS Minify breaks when processing Brizy Builder JS
• fixed: JS Minify breaks Kali Forms
• fixed: empty wp-content folder (/) causes rewriting of page links
• fixed: CDN rewriter throws empty needle warning for strpos
• fixed: CDN rewriter and WebP cache variant incorrectly handle JSON responses
• fixed: jQuery not deferred due to updated markup in core WP
• fixed: unable to remove last rule from Eliminate Unused JS/CSS

1.5.0

• added: preload CSS for Gutenberg, Oxygen, Elementor, GenerateBlocks and Beaver Builder when Optimize CSS Loading is enabled
• added: WebP cache variant supports relative image URLs
• fixed: WebP cache variant setting not saved to disk settings file
• fixed: WebP cache variant removes background images if .webp file does not exist
• fixed: Optimize CSS loading adds extra markup for preloaded theme files

1.4.0

• added: defer and minify functions now support JS/CSS resources added without the WP enqueue system
• added: font optimizer supports CDN domain in CSS URLs
• fixed: font optimizer uses file_get_contents() which is blocked on some servers
• fixed: JS injected incorrectly into certain Oxygen Builder components
• fixed: undefined constant from EWWW IO was triggering a warning
• fixed: Optimize CSS loading skipped stylesheets with empty media attributes
• fixed: cache engine bails if doctype declaration is slightly non-standard

1.3.0

• added: mobile caching available via SWIS_CACHE_MOBILE override, use only if you deliver unique pages to mobile devices
• changed: cache clearing for plugin/theme updates is more efficient
• changed: cache engine begins buffering earlier for improved compatibility with other plugins
• fixed: entire network cache cleared if main site in sub-dir install is cleared
• fixed: cache requirements notice shows to all users
• fixed: cache clearing for WooCommerce stock updates
• fixed: cache clearing redirect fails if Referer header is missing/disabled, results in blank screen
• fixed: cache preloading fails if 301/302 redirect found
• fixed: CDN parser cannot handle img elements with empty src attributes
• fixed: CDN parser regex to detect SVG images in use elements caused excessive backtracking
• fixed: DNS prefetch/preconnect produces invalid HTML when URL does not contain a path
• update: cache clearing behavior for comments reduces unnecessary cache clearing

1.2.1

• added: embedded help and improved documentation for all settings
• changed: failure to insert gzip/cache-control rules in .htaccess failed silently, now displays an admin notice
• fixed: display of Yoast admin bar resources on JS/CSS panel
• fixed: deferring a11y and i18n dependencies causes JS errors
• fixed: cache not cleared after enabling WebP Variant

1.2.0

• added: manage JS/CSS unloads via front-end menu/console
• changed: JS/CSS unload rules use strict matching unless wildcards (*) are used
• changed: new UI to manage JS/CSS unloads
• changed: admin bar items consolidated under SWIS menu
• fixed: prefetch and preconnect hints added incorrectly if SVG title tags found in HTML

1.1.1

• fixed: conditional tag functions called before query is setup
• fixed: WP-CLI error from debug functions

1.1.0

• added: Cache Preload to prime the page cache
• added: minify additional CSS from theme customizer

1.0.5

• changed: Critical CSS inlined earlier, and removed after styles load to avoid conflicts
• fixed: Google Fonts URLs with spaces not handled properly
• fixed: Cache clearing when new comment is submitted throws error

1.0.4

• fixed: Beaver Builder cache clearing throws warnings
• fixed: CDN exclusions not saving properly

1.0.3

• fixed: JS Minify breaks Beaver Builder scripts
• fixed: license validation causes mismatched key
• removed: lazy load, as we already have it in EWWW IO & Easy IO

1.0.2

• added: CDN rewriting for Ultimate Member AJAX requests
• fixed: jQuery safe mode not working with WP 5.6

1.0.1

• added: Lazy Load for external CSS and separate style blocks (div elements only for now)
• changed: better support for WP Offload Media with WebP cache variant
• changed: CDN rewriter has better detection for custom wp-includes and wp-content folders
• fixed: cache engine not finding settings file
• fixed: WP_CACHE not defined when other plugins leave it defined as false after deactivation

1.0.0

• added: docs for finding unused CSS/JS and critical CSS added to Help Beacon
• change: CDN rewriter has better https detection

0.9.5

• added: Cache module has ability to create a WebP version of your pages for supported browsers
• changed: Cache module allows query strings, with a default set of exclusions to bypass caching
• changed: Cache module has smarter cache clearing when a post/page (or any custom post type) is published/updated
• changed: improved detection of existing prefetch/preconnect hints
• fixed: cache clearing by URL for sub-directory installations

0.9.4

• changed: CDN rewriter hooks into more image URL functions
• changed: browser-native lazy loading attributes no longer added by SWIS to prevent theme/plugin conflicts
• changed: license status refreshes automatically when expiration date is reached
• fixed: DNS prefetch function causes warning when using strpos on an array

0.9.3

• fixed: JS/CSS exclusion code running in page builder mode
• fixed: Lazy Loader parsing (and breaking) JSON responses
• fixed: Divi style.css broken by CSS Minify
• fixed: CDN rewriter pre-empts Easy IO rewriting

0.9.2

• added: ability to add domains for DNS prefetch and preconnect hints
• changed: prevent DNS prefetch for fonts.googleapis.com when font optimization is enabled
• changed: use better escaping function for Critical CSS setting
• fixed: license activation error messages not displayed
• fixed: lazy loader not detecting Easy IO capability

0.9.1

• changed: added '.min' suffix to minified JS/CSS files to avoid conflicts with other minifiers.
• fixed: error with Lazy Load and AMP

0.9.0

• First public release!