Created attachment 67490 [details]
GPX file that takes a long time to load

Version:           unspecified (using Devel) 
OS:                Linux

Loading a GPX file - from the command line, or via File - Open in the application - seems to take a long time, several minutes even for a simple file.  This is on a 3-core 2.6GHz CPU with 8Gb memory.  Neither Marble nor any other process is taking 100% CPU or an unreasonable amount of memory.

Attached is a GPX file which demonstrates the problem, which is a GPS recording trimmed to only the relevant parts.  Starting Marble with the command

  marble --debug-info /full/path/to/file.gpx

shows debug information as per the attached log.  The long delay happens near the end, there is a pause of about 3 minutes between the last

StackedTileLoader::loadTile "0:13:4288:2885" 

line and the first

QPixmap: It is not safe to use pixmaps outside the GUI thread

The GPX tracks and waypoints do not appear on the map until the first of the "QPixmap:" messages start coming out.

(To view the GPX file, scroll to Engelberg which is about 25km south of Luzern, Switzerland).


Reproducible: Always

Steps to Reproduce:
Attempt to load the attached GPX file.


Actual Results:  
Long delay before the contents are shown on the map.


Expected Results:  
There should not be such a delay.