I might add a twist into this saga. I run some backend document processing on a VMWare virtualized server (Ubuntu 14.04) with no UI at all. soffice is started as a headless instance and accepts connections on port 8100. After the upgrade to 5.1 the backend document generation slowed down to a crawl. Now it takes 15 minutes(!!!) to build a 30-page long document. The same process before the upgrade used to take less than 15 seconds.
I might add a twist into this saga. I run some backend document processing on a VMWare virtualized server (Ubuntu 14.04) with no UI at all. soffice is started as a headless instance and accepts connections on port 8100. After the upgrade to 5.1 the backend document generation slowed down to a crawl. Now it takes 15 minutes(!!!) to build a 30-page long document. The same process before the upgrade used to take less than 15 seconds.