Export of map does not work + cpu&ram spikes up

When exporting a (whole) map to cell designer (from context menu) the server starts using almost 100% of cpu and lot of memory and does the process times out while keeping the server process using the cpu and memory.

I tried to import new map ( https://minerva-dev.lcsb.uni.lu/minerva/index.xhtml?id=PD_150625_3# ) and it still happens.

However, if you go with exporting only a few nodes (zoomed to max) everything works just fine.