<html> <head> <base href="https://bugs.documentfoundation.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - MacOS: Lots of unresponsiveness (beachballs) when enabling automatic spell checking in a large document" href="https://bugs.documentfoundation.org/show_bug.cgi?id=120014#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - MacOS: Lots of unresponsiveness (beachballs) when enabling automatic spell checking in a large document" href="https://bugs.documentfoundation.org/show_bug.cgi?id=120014">bug 120014</a> from <a class="email" href="mailto:iplaw67@tuta.io" title="Alex Thurgood <iplaw67@tuta.io>"> Alex Thurgood</a> <pre>I had a look at this with Instruments.app, the Apple provided developer tool and carried out a time profile using an older version of the Writer Guide ODT as a test document in a non-debug, production release version of LO 6152. A fairly significant amount of time, when scrolling either with the vertical document scrollbar or the mouse wheel scroll function, comes from : +0x160 callq "PaintHelper::DoPaint(vcl::Region const*)" which is called several hundred times in certain cases, leading to a time occupation of several hundred milliseconds. That call is linked to : vcl::Window::ImplCallPaint(vcl::Region const*, ImplPaintFlags) which calls SwDashedLine::Paint(OutputDevice&, tools::Rectangle const&) I am enclosing a screenshot of the Instruments.app output zoomed in on an area of the trace where the processing time caused a noticeable slowdown/lag in cursor scrolling. Analysing the functions called in this area of the trace points to the calls I indicated above.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>