title: Extension speed issues (database read/write) after upgrade to TYPO3 v10.4
body: <p>After upgrading our TYPO3 website from 8.7 to 9.x to 10.4, a custom-made extension has become twice as slow. More specifically, the reading and writing of the database queries have become slower.</p>
  <p>The extension uses (long and complex) TYPO3 Extbase repository queries and are full compliance with TYPO3 code conventions.</p>
  <p>How come the exact same, unaltered queries run twice as long in TYPO3 v10 compared to v8.7? It is important to mention that no changes were needed to the repository/query code (other than the TCA code and other configuration files) to successfully run the extension in TYPO3 v10. The only issue is the reduced database reading/writing speed.</p>
  <p>Also, the v10 TYPO3 instance runs on the exact same server and the same environment. The only difference is the PHP version (7.1 vs 7.3).</p>
  <p>Any insights into this would be greatly appreciated.</p>