How to exclude typo3temp directory from ddev to get more performance

docker-compose.override.yaml

# Move typo3temp into RAM-Disk. Do not sync vendor and TYPO3-Directory.
# For MAC: 'nocopy' will only work correct, if nfs_mount_enabled is true
version: '3.6'
services:
  web:
    volumes:
      - type: tmpfs
        tmpfs:
          size: 268435456
        # TYPO3 8
        target: /var/www/html/public/typo3temp/var/Cache
        # TYPO3 9 and 10
        target: /var/www/html/var
      - type: volume
        source: typo3_source_[shortProjectName]
        target: /var/www/html/public/typo3
        volume:
          nocopy: true
      - type: volume
        source: vendor_[shortProjectName]
        target: /var/www/html/vendor
        volume:
          nocopy: true
    environment:
      DDEV_UID:
      DDEV_GID:
volumes:
  typo3_source_[shortProjectName]:
    driver: local
  vendor_[shortProjectName]:
    driver: local

# Add these lines (un-commented) to config.yaml to change restriction from root to current user
hooks:
  post-start:
    - exec: bash -c "sudo mkdir -p /var/www/html/public/typo3"
    - exec: bash -c "sudo chown -R ${DDEV_UID}:${DDEV_GID} /var/www/html/public/typo3"
    - exec: bash -c "sudo mkdir -p /var/www/html/vendor"
    - exec: bash -c "sudo chown -R ${DDEV_UID}:${DDEV_GID} /var/www/html/vendor"
    # TYPO3 8
    - exec: bash -c "sudo mkdir -p /var/www/html/public/typo3temp"
    - exec: bash -c "sudo chown -R ${DDEV_UID}:${DDEV_GID} /var/www/html/public/typo3temp"
    # TYPO3 9 and 10. Do not add cache directory, as TYPO3 renames the folder before deletion
    - exec: bash -c "sudo mkdir -p /var/www/html/var"
    - exec: bash -c "sudo chown -R ${DDEV_UID}:${DDEV_GID} /var/www/html/var"

# Move TYPO3 10 Caches into RAM-Disk. Modify AdditionalConfiguration.php.
# For TYPO3 < 10 you have to add "cache_" for each Cache. F.e. cache_rootline
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase']['backend'] = \TYPO3\CMS\Core\Cache\Backend\ApcuBackend::class;
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase']['options'] = [];
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['rootline']['backend'] = \TYPO3\CMS\Core\Cache\Backend\ApcuBackend::class;
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['rootline']['options'] = [];
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['hash']['backend'] = \TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend::class;
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['hash']['options'] = [];
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend'] = \TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend::class;
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['options'] = [];
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pagesection']['backend'] = \TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend::class;
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pagesection']['options'] = [];

# Add this line only for TYPO3 < 10
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['imagesizes']['backend'] = \TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend::class;

@t3easy: Thank you I have update my gist.
var/cache? As this is part of typo3temp why should I add an extra volume for that?

Ok...found it. I have updated my gist.

@froemken To be consistent ... I guess www should be public at line 10.

# TYPO3 8
target: /var/www/html/public/typo3temp/var/Cache

@rasgor Thank you. I have updated the line: "web"->"public" ... not "www" ;-)

Works for Shopware and Magento, too, if target is set to /var/www/html/var/cache of the tmpfs volume. Great!

Since TYPO3 v10.3 (?) cache for imagesizes seems to have compression enabled in options by default. So this has to be disabled, too.

Are you using tmpfs + mutagen in actual TYPO3 projects?

@josefglatz no