Work with Query Results in RTC (Java API client side)

I have query (already build) who return 2 columns with workItem ID and text custom field from all workitems from current Project Area. How can I get only result values, without getting WorkItem from queryResult, and get custom filed from him (it works, but takes a lot of time on big result set)?

my code:

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IQueryDescriptor query = findPersonalQuery(pa, queryName, mon); //function for find queryDescriptor by name

if (query != null) { //query_find!

IWorkItemClient workItemClient = (IWorkItemClient) repo.getClientLibrary(IWorkItemClient.class);

IQueryClient queryClient = workItemClient.getQueryClient();

IQueryResult unresolvedResults = queryClient.getQueryResults(query);

if (unresolvedResults != null) { //query_OK

long total = unresolvedResults.getTotalSize(mon);

long pages = (total % 256);

long curPage = 0;

ResultSize resultSize = unresolvedResults.getResultSize(mon);

IAuditableCommon auditableCommon = (IAuditableCommon) repo.getClientLibrary(IAuditableCommon.class);

while (unresolvedResults.hasNext(mon)) { //GO_to_results_in_page

IResult result = (IResult) unresolvedResults.next(mon);

IWorkItem workItem = auditableCommon.resolveAuditable((IAuditableHandle) result.getItem(), IWorkItem.FULL_PROFILE, mon);

 

// get custom text attribute

String val = getCustomAttributeValueByIdentifierAsString(workItem, repo, "custom.field.identifer.txt", mon, true);

} //GO_to_results_in_page

} //query_OK

else System.out.println("INFO : no results!");

} //query_find!

else System.out.println("ERROR  : query \"" + queryName + "\" not found!!!");

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I try use IWorkItem.SMALL_PROFILE  but it did'n get some performance.