Streamline variable match

Working with SharePoint list and JavaScript I am using CAML Query to retrieve data from a SharePoint list ie (Employee name) then SPServices to get the current logon user, I now need a fast way to compare the two and populate that users data to a custom form. i have a working code for this but the list has 4000 entries and is timing out on the server. Is there a more efficient way of comparing?

$(document).ready(function() {
        //The Web Service method we are calling, to read list items we use 'GetListItems'
        var method = "GetListItems";
        //The display name of the list we are reading data from
        var list = "EmployeeData2";

        var fieldsToRead =     "<ViewFields>" +
                                            "<FieldRef Name='ID' />" +
                                            "<FieldRef Name='Supervisor' />" +
                                                "<FieldRef Name='Pay' />" +
                                                "<FieldRef Name='Location' />" +
                                "<FieldRef Name='Email' />" +
                                "<FieldRef Name='Employee' />" +
                                "<FieldRef Name='FirstName' />" +
                                "<FieldRef Name='LastName' />" +
                                "<FieldRef Name='City' />" +
        var query = "<Query>" +
                        "<Where>" +
                            "<Neq>" +
                                "<FieldRef Name='ID'/><Value Type='Number'>0</Value>" +
                            "</Neq>" +
                        "</Where>" +
                        "<OrderBy>" +
                            "<FieldRef Name='ID'/>" +
                        "</OrderBy>" +

        //Here is our SPServices Call where we pass in the variables that we set above
                operation: method,
                async: false,  //if you set this to true, you may get faster performance, but your order may not be accurate.
                listName: list,
                CAMLViewFields: fieldsToRead,
                  CAMLQuery: query,
                      //this basically means "do the following code when the call is complete"
                    completefunc: function (xData, Status) {
                        //this code iterates through every row of data returned from the web service call
                        $(xData.responseXML).SPFilterNode("z:row").each(function() {
                            //here is where we are reading the field values and putting them in JavaScript variables
                            //get the title field (ID)
                            var empNumber = ($(this).attr("ows_Employee"));
                            //get eployee first name
                            var empFname = ($(this).attr("ows_FirstName"));
                            //get emplyee last name
                            var empLname = ($(this).attr("ows_LastName"));

                            var empSup = ($(this).attr("ows_Supervisor"));

                            var empPay = ($(this).attr("ows_Pay"));

                            var empLoc = ($(this).attr("ows_Location"));

var firstName = $().SPServices.SPGetCurrentUser({
             fieldName: "FirstName"              
         if(empFname == firstName){

//alert("Not a match");
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Rajendra ShekhawatSolution ArchitectCommented:

Which version of SharePoint you are using ?

If using SP 2013, you can look into REST API and Filter operators to get corresponding data from server itself.

cbridgesazAuthor Commented:
I actually solved this issue by adjusting the query filter to lookup and compare user name in list  with logged in user, this created a smaller range for the .SPServices call to sort out, speeding up the comparison extremely.

var firstName = $().SPServices.SPGetCurrentUser({
             fieldName: "FirstName"              
            var query = "<Query>" +
                        "<Where>" +
                            "<Eq>" +
                                "<FieldRef Name='FirstName'/><Value Type='Text'>" + firstName + "</Value>" +
                            "</Eq>" +
                        "</Where>" +
                        "<OrderBy>" +
                            "<FieldRef Name='ID'/>" +
                        "</OrderBy>" +

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cbridgesazAuthor Commented:
Adjusting the filter gave a smaller query range which sped up the search.
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