Boost the speed of Kirby by having content files of files/pages/users cached, with fast lookup based on uuid.

2.2.0 2023-02-01 09:58 UTC


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Boost the speed of Kirby by having content files of files/pages/users cached, with fast lookup based on uuid.

Commercial Usage

Support open source!

This plugin is free but if you use it in a commercial project please consider to sponsor me or make a donation.
If my work helped you to make some cash it seems fair to me that I might get a little reward as well, right?

Be kind. Share a little. Thanks.

‐ Bruno
Github sponsor Patreon Buy Me a Coffee Paypal dontation Hire me


  • unzip as folder site/plugins/kirby3-boost or
  • git submodule add site/plugins/kirby3-boost or
  • composer require bnomei/kirby3-boost


If you have to process within a single request a lot of page objects (1000+) or if you have a lot of relations between page objects to resolve then consider using this plugin. With less page objects you will probably not gain enough to justify the overhead.

How does this plugin work?

  • It caches all content files and keeps the cache up to date when you add or modify content. This cache will be used when constructing page objects making everything that involves page objects faster (even the Panel).
  • It provides a benchmark to help you decide which cachedriver to use.
  • It will use Kirby's uuid (unique id) for page objects to create relations that do not break even if the slug or directory of a page object changes.
  • It provides a very fast lookup for page objects via id, diruri or the uuid.


For each template you want to be cached you need to use a model to add the content cache logic using a trait.


class DefaultPage extends \Kirby\Cms\Page
    use \Bnomei\ModelHasBoost;

Since in most cases you will be using Kirbys autoloading for the pagemodels your classname needs to end in Page. Like site/models/article.php and ArticlePage or site/models/blogpost.php and BlogpostPage.

As a last step fill the boost cache in calling the following in a template or controller. You only have to do this once (not on every request).

// fill cache
$count = site()->boost();
echo $count . ' Pages have been boosted.';

Congratulations! Now your project is boosted.

User Models

Starting with version 1.9 you can also cache the content files of user models using the respective traits/extends in your custom models via a custom plugin.

class AdminUser extends \Kirby\Cms\User
    use \Bnomei\ModelHasBoost;

Kirby::plugin('myplugin/user', [
    'userModels' => [
        'admin' => AdminUser::class, // admin is default role

File Models

Starting with version 2.0 the plugin to monkey patch the core Files class with content cache support. You can only turn this on or off for all files at once since Kirby does not allow custom File models. It would need to read content file first which would defeat the purpose for a content cache anyway.



return [
    // other options
    'bnomei.boost.patch.files' => true, // default: true

Pages Field Alternative

This plugin provided a pages field alternative based on the multiselect field and optimized for performance.


preset: page

    extends: fields/boostidkv

    extends: fields/boostidkvs

You can create your own fields for related pages based on the fields and collections this plugins provides.

Easier loading of custom models, blueprints, ...

When you use boost your project you might end up with a couple of custom models in a plugin. You can use my autoloader helper to make registering these classes a bit easier. It can also load blueprints, classes, collections, controllers, blockModels, pageModels, routes, api/routes, userModels, snippets, templates and translation files. If you installed the Boost plugin via composer the autoloader helper was installed as a dependency, and you can start using it straight way.


Page from PageId

$page = page($somePageId); // slower
$page = boost($somePageId); // faster

Page from DirUri

$page = boost($somePageDirUri); // fastest

Page from uuid

$page = page($uuid); // slower
$page = boost($uuid); // will use fastest internally

Pages from uuids

$pages = pages([$uuid1, $uuid2, ...]); // slower
$pages = boost([$uuid1, $uuid2, ...]); // will use fastest internally

Resolving relations

Fields where defined in the example blueprint above.

// one
$pageOrNull = $page->one_relation()->toPage(); // slower
$pageOrNull = $page->one_relation()->toPageBoosted(); // faster

// many
$pagesCollectionOrNull = $page->many_related()->toPages(); // slower
$pagesCollectionOrNull = $page->many_related()->toPagesBoosted(); // faster

Modified timestamp from cache

This will try to get the modified timestamp from cache. If the page object content can be cached but currently was not, it will force a content cache write. It will return the modified timestamp of a page object or if it does not exist it will return null.

$pageModifiedTimestampOrNull = modified($someUuidOrPageId); // faster

Search for Template from cache

It will return a collection page object(s) and you can expect this to be a lot faster than calling site()->index()->template('myTemplateName')

 // in full site index
$allPagesWithTemplatePost = site()->searchForTemplate('post');

 // starting with blog as parent
$pagesWithTemplatePostInBlog = page('blog')->searchForTemplate('post');

Caches and Cache Drivers

A cache driver is a piece of code that defines where get/set commands for the key/value store of the cache are directed to. Kirby has built in support for File, Apcu, Memcached and Memory. I have created additional cache drivers for MySQL, Redis, SQLite and PHP.

Within Kirby caches can be used for:

  • Kirbys own Pages Cache to cache fully rendered HTML code
  • Plugin Caches for each individual plugin
  • The Content Cache provided by this plugin
  • Partial Caches like my helper plugin called Lapse
  • Configuration Caches are not supported yet

To optimize performance it would make sense to use the same cache driver for all but the Pages Cache. The Pages Cache is better of in a file cache than anywhere else.


If you have APCu cache available and your content fits into the defined memory limit use the apcu cache driver.

Debug = read from content file (not from cache)

If you set Kirbys global debug option to true the plugin will not read the content cache but from the content file on disk. But it will write to the content cache so you can get debug messages if anything goes wrong with that process.

Forcing a content cache update

You can force writing outdated values to the cache manually but doing that should not be necessary.

// write content cache of a single page
$cachedYesOrNoAsBoolean = $page->boost();

// write content cache of all pages in a Pages collection
$durationOfThisCacheIO = $page->children()->boost();

// write content cache of all pages in site index
$durationOfThisCacheIO = site()->boost();


How much and if you gain anything regarding performance depends on the hardware. All your content files must fit within the memory limitation. If you run into errors consider increasing the server settings or choose a different cache driver.

Defaults for Memcached APCu Redis MySQL SQLite
max memory size 64MB 32MB 0 (none) 0 (none) 0 (none)
size of key/value pair 1MB 4MB 512MB 0 (none) 0 (none)


The included benchmark can help you make an educated guess which is the faster cache driver. The only way to make sure is measuring in production. Be aware that this will create and remove 1000 items cached. The benchmark will try to perform as many get operations within given timeframe (default 1 second per cache). The higher results are better.

// use helpers to generate caches to compare
// rough performance level is based on my tests
$caches = [
    // better
    // \Bnomei\BoostCache::null(),
    // \Bnomei\BoostCache::memory(),
    \Bnomei\BoostCache::php(),       // 142
    \Bnomei\BoostCache::apcu(),      // 118
    \Bnomei\BoostCache::sqlite(),    //  60
    \Bnomei\BoostCache::redis(),     //  57
    // \Bnomei\BoostCache::file(),   //  44
    \Bnomei\BoostCache::memcached(), //  11
    // \Bnomei\BoostCache::mysql(),  //  ??
    // worse

// run the cachediver benchmark
var_dump(\Bnomei\CacheBenchmark::run($caches, 1, 1000)); // a rough guess
var_dump(\Bnomei\CacheBenchmark::run($caches, 1, site()->index()->count())); // more realistic
  • Memory Cache Driver and Null Cache Driver would perform best but it either caches in memory only for current request or not at all and that is not really useful for this plugin.
  • PHP Cache Driver will be the fastest possible solution, but you might run out of php app memory. Use this driver if you need ultimate performance, have full control over your server php.ini configs and the size of your cached data fits within you application memory. But this driver is not suited well for concurrent writes from multiple requests with overlapping processing time.
  • APCu Cache can be expected to be very fast but one has to make sure all content fits into the memory limitations. You can also use my apcu cachedriver with garbage collection
  • SQLite Cache Driver will perform very well since everything will be in one file and I optimized the read/write with pragmas and wal journal mode. Content will be written using transactions.
  • My Redis Cache Driver has smart preloading using the very fast Redis pipeline and will write changes using transactions.
  • The MySQL Cache Driver is slightly slower than Redis and uses transactions as well.
  • The File Cache Driver will perform worse the more page objects you have. You are probably better of with no cache. This is the only driver with this flaw. Benchmarking this driver will also create a lot of file which in total might cause the script to exceed your php execution time.

But do not take my word for it. Download the plugin, set realistic benchmark options and run the benchmark on your production server.

Interactive Demo

I created an interactive demo to compare various cache drivers and prove how much your website can be boosted. It kind of ended up as a love-letter to the KQL Plugin as well. You can find the benchmark and interactive demos here:

Headless Demo

You can either use this interactive playground or a tool like HTTPie, Insomnia, PAW or Postman to connect to the public API of the demos. Queries are sent to the public API endpoint of the KQL Plugin. This means you can compare response times between cache drivers easily.

HTTPie examples

# get benchmark comparing the cachedrivers
http POST --json

# get boostmark for a specific cache driver
http POST --json

# compare apcu and sqlite
http POST -a < myquery.json
http POST -a < myquery.json


Once you know which driver you want to use you can set the plugin cache options.



return [
    // other options
    // like Pages or UUID Cache
    // cache type for each plugin you use like the Laspe plugin

    // default is file cache driver because it will always work
    // but performance is not great so set to something else please
    'bnomei.boost.cache' => [
        'type'     => 'file',

    // example php
    'bnomei.boost.cache' => [
        'type'     => 'php',
    'cache' => [
        'uuid' => [
            'type' => 'php',

    // example apcu
    'bnomei.boost.cache' => [
        'type'     => 'apcu',
    'cache' => [
        'uuid' => [
            'type' => 'apcu',
    // example apcu with garbage collection
    'bnomei.boost.cache' => [
        'type'     => 'apcugc',
    'cache' => [
        'uuid' => [
            'type' => 'apcugc',

    // example sqlite
    'bnomei.boost.cache' => [
        'type'     => 'sqlite',
    'cache' => [
        'uuid' => [
            'type' => 'sqlite',

    // example redis
    'bnomei.boost.cache' => [
        'type'     => 'redis',
        'host'     => function() { return env('REDIS_HOST'); },
        'port'     => function() { return env('REDIS_PORT'); },
        'database' => function() { return env('REDIS_DATABASE'); },
        'password' => function() { return env('REDIS_PASSWORD'); },
    'cache' => [
        'uuid' => [
            // do same as boost

    // example memcached
    'bnomei.boost.cache' => [
        'type'     => 'memcached',
        'host'     => '',
        'port'     => 11211,
    'cache' => [
        'uuid' => [
            // do same as boost

Verify with Boostmark

First make sure all boosted pages are up-to-date in cache. Run this in a template or controller once. This will also add an unique id to boosted pages that do not have one yet (reindexing).

// this can be skipped on next benchmark

Then comment out the forced cache update and run the benchmark that tracks how many and how fast your content is loaded.

// site()->boost();

If you are interested in how fast a certain pages collection loads you can do that as well.

// site()->boost();

Site Index with lower memory footprint

Using site()->index() in Kirby will load all Pages into memory at the same time. This plugin provides a way to iterate over the index with having only one page loaded at a time.

$boostedCount = 0;
$indexCount = \Bnomei\Bolt::index(function ($page) use (&$boostedCount) {
    // do something with that $page like...
    $boostedCount += $page->boost() ? 1 : 0;
// or just
$boostedCount = site()->boost();


bnomei.boost. Default Description
hashalgo xxh3,crc32 used hash algorithm php8.1+/php8.0
expire 0 expire in minutes for all caches created
read true read from cache
write true write to cache
drafts true index drafts
patch.files true monkey patch Files Class to do content caching
fileModifiedCheck false expects file to not be altered outside of kirby
helper true allow usage of boost() helper

External changes to content files

If your content file are written to by any other means than using Kirbys page object methods you need to enable the bnomei.boost.fileModifiedCheck option or overwrite the checkModifiedTimestampForContentBoost(): bool method on a model basis. This will reduce performance by about 1/3 but still be faster than without using a cache at all.


This plugin is provided "as is" with no guarantee. Use it at your own risk and always test it yourself before using it in a production environment. If you find any issues, please create a new issue.



It is discouraged to use this plugin in any project that promotes racism, sexism, homophobia, animal abuse, violence or any other form of hate speech.