Nick,

to solve out of memory issue, i think you can make below change:
1) in solrsconfig.xml, reduce ramBufferSizeMB (there are two, change both)
2) in solrsconfig.xml, reduce documentCache value

to solve call commit slow down index issue, i think you can change new
search default queyr:
in solrsconfig.xml, search for 
<listener event="newSearcher" class="solr.QuerySenderListener">
change 
<str name="q">content:*</str> <str name="start">0</str> <str
name="rows">10</str>
to
<str name="q">content:notexist</str> <str name="start">0</str> <str
name="rows">10</str>

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