api.languagetool.org is always using direct connection even if Proxy was set and not use LanguageTools. Option | Language Setting | LanguageTools Server | [ ] Enable LanguageTools Option | Internet | Proxy | Proxy Server [Manual] (Once changed to [None] or [Manual], you can not set to [System] at ver.7.5.5.2) If api.languagetool.org to 127.0.0.1 by HOSTS file, it takes few seconds to open Calc Workbook with contains one Line shape. If BaseURL to invalid (https://api.languagetool.org/v2 to https://DISABLED-api.languagetool.org/v2), opens fine.