Suggests

• ext-apcu: Faster web responses overall.
• ext-bcmath: Increased performance of some operations. Required especially on 32 bit machines. This or ext-gmp are needed for scrambling Temporary Accounts.
• ext-curl: Faster HTTP services, e.g. when using InstantCommons, Swift, or Etcd.
• ext-exif: Enable processing of EXIF information in file uploads.
• ext-gd: Enable thumbnails for file uploads.
• ext-gmp: Increased performance of some operations. Required especially on 32 bit machines. This or ext-bcmath are needed for scrambling Temporary Accounts.
• ext-mysqli: Enable the MySQL and MariaDB database type for MediaWiki.
• ext-openssl: Encrypt session data (or opt-out via $wgSessionInsecureSecrets).
• ext-pcntl: Enable CLI concurrent processing, e.g. for runJobs.php and rebuildLocalisationCache.php.
• ext-pdo: Enable the SQLite database type for MediaWiki.
• ext-pgsql: Enable the PostgreSQL database type for MediaWiki.
• ext-posix: Enable CLI concurrent processing, e.g. for runJobs.php.
• ext-readline: Enable CLI history and autocomplete, e.g. for eval.php and other REPLs.
• ext-sockets: Enable CLI concurrent processing, e.g. for rebuildLocalisationCache.php.
• ext-wikidiff2: Faster text difference engine.
• ext-zlib: Enable use of GZIP compression, e.g. for SqlBagOStuff (ParserCache), $wgCompressRevisions, or $wgUseFileCache.
• monolog/monolog: Enable use of MonologSpi ($wgMWLoggerDefaultSpi).