I have multiple service data and I fetch and then on that I iterate the elements to get some info and then build the cells, which sometimes I see it goes on time out:

For createLEmentRow:

public GQIPage GetNextPage(GetNextPageInputArgs args)
{
const int batchSize = 25;
var rows = new List<GQIRow>();

var serviceList = GetElements();
_logger.Information("SERVICE LIST -- " + serviceList.Count);

Parallel.ForEach(serviceList, service =>
{
_logger.Information("ServiceName - " + service.Name);
Parallel.ForEach(service.Children, childInfo =>
{
var localRows = new List<GQIRow>();
CreateElementRow(localRows, childInfo, service.Name);
lock (_allRows)
{
_allRows.AddRange(localRows);
_logger.Information("ALL ROWS Length -- " + _allRows.Count);
}

private void CreateElementRow(List<GQIRow> rows, LiteServiceChildInfo element, string name)
{
var cells = Enumerable.Repeat(new GQICell { Value = "" }, _resources.Count + 2).ToArray();
var lockObject = new object(); // Lock object for thread safety

// Separate parameters into two groups
var group1 = element.Parameters.Where(p => p.ParameterID >= 7004 && p.ParameterID <= 7035).ToList();
var group2 = element.Parameters.Where(p => p.ParameterID >= 703 && p.ParameterID <= 1908).ToList();

// Define a method to process a group of parameters
void ProcessGroup(List<ServiceParamFilter> group, int endParameterId, string groupName)
{
foreach (var parameter in group)
{
var data = _resources.Find(x => x.ParamterId.Equals(parameter.ParameterID));
if (data == null)
{
continue;
}

_logger.Information($"START {groupName}");
lock (lockObject)
{
BuildCells(parameter, element, ref cells, rows);
}

........

private void BuildCells(ServiceParamFilter parameter, LiteServiceChildInfo element, ref GQICell[] cells,
List<GQIRow> rows)
{
string cellValue = string.Empty; // Default value.
ResourcesDetails data = null;
data = _resources.Find(x => x.ParamterId.Equals(parameter.ParameterID));
if (data == null)
{
return;
}

try
{
var requestMsg = new GetParameterMessage(element.DataMinerID, element.ElementID,
parameter.ParameterID,
parameter.FilterValue, true);
var paramInfo = _dms.SendMessage(requestMsg) as GetParameterResponseMessage;
//var paramInfo = responseMsg.ChangeType<GetParameterResponseMessage>().OfType<GetParameterResponseMessage>().FirstOrDefault();
cellValue = paramInfo.Value.ToString().Equals("EMPTY", StringComparison.CurrentCultureIgnoreCase)
? string.Empty
: paramInfo.Value.ToString();