Move PluginHelper.getPluginSaveFile() outside loop

[willglynn]

I'm noticing a significant performance degradation as my career-mode game progresses. This may not be related, but at the very least we don't need to parse the config file once per vessel per microwave receiver.

[Joeppie]

I have had the same issue. I was suprised to find a new non-carreer game having much better performance all-round. This definitely should be considered.

[williamh42]

I just submitted a pull request for another career mode slowdown related to checking for techs for upgrades that is similar to this - glancing at this it looks like this bug could be even more thoroughly squashed (with a substantial performance improvement) by simply caching the ConfigNode and only reading it in if the cached object is for some reason destroyed - from what I can tell the plugin save file shouldn't ever be modified by anything other than KSPInterstaller's own code correct? I might try that myself unless someone knows of a problem that might cause...

Either way this is a good, and very simple fix.

[Boris-Barboris]

#72

Spent a couple of hours on microwave code refactoring. There is no need now in FS operations at all.