如何加快我的实体框架LINQ查询？

Question

很抱歉这样一般的问题..我正在使用Entity＆amp; LINQ查询名​​为Patient.的表（Model）我的目标是使用JqueryUI的自动完成来协助ASP.Net MVC 5建议的搜索文本栏，您可以在其中使用字符串作为患者姓名，但也可以使用其中的键。同一个盒子。这是我的模型：

public partial class Patient
{
    public Patient()
    {
        PickupExchange = new HashSet<PickupExchange>();
        SalesOrder2 = new HashSet<SalesOrder2>();
    }

    public int PtKey { get; set; }
    public int? PatientId { get; set; }
    public string LastName { get; set; }
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string BillingAddress1 { get; set; }
    public string BillingAddress2 { get; set; }
    public string BillingCity { get; set; }
    public string BillingState { get; set; }
    public string BillingZip { get; set; }
    public string BillingPhone { get; set; }
    public string Faxnumber { get; set; }
    public string EmailAddress { get; set; }
    public string MobilePhone { get; set; }
    public string Suffix { get; set; }
    public DateTime? Dob { get; set; }
    public string Ssn { get; set; }
    public string HoldAcct { get; set; }
    public string AccountNumber { get; set; }
    public string AccountGrp { get; set; }
    public string Sex { get; set; }
    public decimal? Height { get; set; }
    public decimal? Weight { get; set; }
    public string MaritalStatus { get; set; }
    public string Employment { get; set; }
    public byte? DiscountPct { get; set; }
    public byte? BranchKey { get; set; }
    public string DelivAddress1 { get; set; }
    public string DelivAddress2 { get; set; }
    public string DelivCity { get; set; }
    public string DelivState { get; set; }
    public string DelivZip { get; set; }
    public string DelivPhone { get; set; }
    public string User1 { get; set; }
    public string User2 { get; set; }
    public string User3 { get; set; }
    public string User4 { get; set; }
    public string EclastName { get; set; }
    public string EcfirstName { get; set; }
    public string EcmiddleName { get; set; }
    public string Ecaddress1 { get; set; }
    public string Ecaddress2 { get; set; }
    public string Eccity { get; set; }
    public string Ecstate { get; set; }
    public string EcpostalCode { get; set; }
    public string EcphoneNum { get; set; }
    public string Ecfax { get; set; }
    public string Ecemail { get; set; }
    public string Rprelationship { get; set; }
    public string RplastName { get; set; }
    public string RpfirstName { get; set; }
    public string RpmiddleName { get; set; }
    public string Rpaddress1 { get; set; }
    public string Rpaddress2 { get; set; }
    public string Rpcity { get; set; }
    public string Rpstate { get; set; }
    public string RppostalCode { get; set; }
    public string RpphoneNum { get; set; }
    public string Rpfax { get; set; }
    public string Rpemail { get; set; }
    public string HippasignatureOnFile { get; set; }
    public string TaxZone { get; set; }
    public string BillingCounty { get; set; }
    public string DeliveryCounty { get; set; }
    public int? ReferralKey { get; set; }
    public string ReferralType { get; set; }
    public short? CreatedBy { get; set; }
    public DateTime? CreateDt { get; set; }
    public string NickName { get; set; }
    public string AutoChargeCc { get; set; }
    public string SarautoPayStatus { get; set; }
    public string SareDeliveryStatus { get; set; }
    public string SarpaymentPlan { get; set; }
    public string Sarinformation { get; set; }
    public DateTime UpdateDt { get; set; }
    public DateTime? Dod { get; set; }
}

问题是我的SQL表中包含的所有患者数据绝对是巨大的。我正在使用我的LINQ查询将一个TOP 10作为json返回到我的javasript函数：

 var alreadyRunning = false;
 patientID.bind('input', function () {
    if (alreadyRunning == false) {
        alreadyRunning = true;
        $.ajax({
            type: 'POST',
            url: '/Controller/Model',
            dataType: 'json',
            data: {
                patientID: patientID.val()
            },
            success(data) {
                patientID.autocomplete({
                    source: data
                });
                alreadyRunning = false;
            }
            , failure(data) {
                alert("Error Searching Value: " + patientID.val());
                alreadyRunning = false;
            }
            , error(data) {
                alert("Error Searching Value: " + patientID.val());
                alreadyRunning = false;
            }
        });
    }
    else {
        patientID.autocomplete({
            source: ["None"]
        });
    }

这个LINQ查询保持超时，我找不到加速查询的方法..我做错了什么或我的数据集太大了？

  ptTable = int.TryParse(patientID, out number) ?
        btd.Patient.Where(x => x.Database == "databaseName" && x.PatientId.ToString().StartsWith(number.ToString())).OrderBy(x => x.LastName).Take(10).ToList() :
        btd.Patient.Where(x => x.Database == "databaseName" && x.LastName.ToLower() + ", " + x.FirstName.ToLower()).StartsWith(patientID.ToLower()).OrderBy(x => x.LastName).Take(10).ToList();    

对SQL执行快速执行的字符串操作是否过多？任何建议都会非常有益！