Try using phpdbg to speed up coverage build.

.travis.yml

@@ -41,7 +41,7 @@ matrix:
       env: PHPSTAN=1 DEFAULT=0
 
 before_install:
-  - if [ $TRAVIS_PHP_VERSION != 7.0 && $TRAVIS_PHP_VERSION != 'nightly' ]; then phpenv config-rm xdebug.ini; fi
+  - phpenv config-rm xdebug.ini
 
   - if [ $DB = 'mysql' ]; then mysql -u root -e 'CREATE DATABASE cakephp_test;'; fi
   - if [ $DB = 'mysql' ]; then mysql -u root -e 'CREATE DATABASE cakephp_test2;'; fi
@@ -56,16 +56,18 @@ before_install:
   - if [[ $DEFAULT = 1 || $PHPSTAN = 1 ]] ; then echo 'extension = redis.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
   - if [[ $DEFAULT = 1 || $PHPSTAN = 1 ]] ; then echo 'extension = apcu.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
   - if [[ $DEFAULT = 1 || $PHPSTAN = 1 ]] ; then echo 'apc.enable_cli = 1' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
+
   - if [[ ${TRAVIS_PHP_VERSION:0:1} == "7" ]] ; then echo "yes" | pecl install channel://pecl.php.net/apcu-5.1.5 || true; fi
   - if [[ ${TRAVIS_PHP_VERSION:0:1} == "5" ]] ; then echo "yes" | pecl install apcu-4.0.11 || true; fi
   - if [[ ${TRAVIS_PHP_VERSION:0:1} == "5" && $DB = 'mysql' ]] ; then wget http://xcache.lighttpd.net/pub/Releases/3.2.0/xcache-3.2.0.tar.gz; tar xf xcache-3.2.0.tar.gz; pushd xcache-3.2.0; phpize; ./configure; make; NO_INTERACTION=1 make test; make install; popd;printf "extension=xcache.so\nxcache.size=64M\nxcache.var_size=16M\nxcache.test=On" > ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
+
   - sudo locale-gen da_DK
 
 before_script:
   - composer install --prefer-dist --no-interaction
 
 script:
-  - if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION = 7.0 ]]; then export CODECOVERAGE=1; vendor/bin/phpunit --coverage-clover=clover.xml; fi
+  - if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION = 7.0 ]]; then export CODECOVERAGE=1; phpdbg -qrr vendor/bin/phpunit --coverage-clover=clover.xml; fi
   - if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION != 7.0 ]]; then vendor/bin/phpunit; fi
 
   - if [[ $PHPCS = 1 ]]; then composer cs-check; fi