Today i have tried this tool because i wanted to have bigger fat table (512mb) because newer builds do not work anymore.
So did everythibg and the problem is still there like this one
OpenELEC Mediacenter - OpenELEC Forum - Slow boot Openelec Zotac D2550 (1/1)
The last one that has created the right partition was openelec 5.0.8. On newer installers the boot is slow and unusable.