Redis cache very slow on Magento 2.4.6

L2 cache is a cache using the CPU's cores. But it is still the Redis you know.

To enable it, you need to configure your Stale cache options like below or your env.php:

'cache' => [ 'frontend' => [ 'default' => [ 'backend' => '\\Magento\\Framework\\Cache\\Backend\\RemoteSynchronizedCache', 'backend_options' => [ 'remote_backend' => '\\Magento\\Framework\\Cache\\Backend\\Redis', 'remote_backend_options' => [ 'persistent' => 0, 'server' => 'localhost', 'database' => '0', 'port' => '6379', 'password' => '', 'compress_data' => '1', ], 'local_backend' => 'Cm_Cache_Backend_File', 'local_backend_options' => [ 'cache_dir' => '/dev/shm/' ], 'use_stale_cache' => false, ], 'frontend_options' => [ 'write_control' => false, ], ], 'stale_cache_enabled' => [ 'backend' => '\\Magento\\Framework\\Cache\\Backend\\RemoteSynchronizedCache', 'backend_options' => [ 'remote_backend' => '\\Magento\\Framework\\Cache\\Backend\\Redis', 'remote_backend_options' => [ 'persistent' => 0, 'server' => 'localhost', 'database' => '0', 'port' => '6379', 'password' => '', 'compress_data' => '1', ], 'local_backend' => 'Cm_Cache_Backend_File', 'local_backend_options' => [ 'cache_dir' => '/dev/shm/' ], 'use_stale_cache' => true, ], 'frontend_options' => [ 'write_control' => false, ], ] ], 'type' => [ 'default' => ['frontend' => 'default'], 'layout' => ['frontend' => 'stale_cache_enabled'], 'block_html' => ['frontend' => 'stale_cache_enabled'], 'reflection' => ['frontend' => 'stale_cache_enabled'], 'config_integration' => ['frontend' => 'stale_cache_enabled'], 'config_integration_api' => ['frontend' => 'stale_cache_enabled'], 'full_page' => ['frontend' => 'stale_cache_enabled'], 'translate' => ['frontend' => 'stale_cache_enabled'] ], ], 

Take a look at the Redis preload and parallel features. If you need to validate the changes, you can run these commands:

redis-cli ping; redis-cli monitor;