Merge pull request #107389 from BrianMouncer/BrianMouncer-pr/CRL_Note

add a note to the Linuc OpenSSL and PERF

Author: PRMerger16

articles/cognitive-services/Speech-Service/how-to-configure-openssl-linux.md

@@ -45,6 +45,8 @@ Set environment variable `SSL_CERT_FILE` to point at that file before running a
 ```bash
 export SSL_CERT_FILE=/etc/pki/tls/certs/ca-bundle.crt
 ```
+> [!NOTE]
+> It is also worth noting that some distributions of Linux do not have a TMP or TMPDIR environment variable defined. This will cause the Speech SDK to download the Certificate Revocation List (CRL) every time, rather than caching the CRL to disk for reuse until they expire. To improve initial connection performance you can [create an environment variable named TMPDIR and set it to the path of your chosen temporary directory.](https://help.ubuntu.com/community/EnvironmentVariables).
 
 ## Next steps