❔ API Call really slow (6+ seconds) on first call, then fast (100ms) afterwards

[HttpGet]
public async Task<IActionResult> GetList()
{
   // ** todo get this to order by OrderIndex **
   var dynContentList = _context.DynamicContents
      .OrderByDescending(x => x.OrderIndex)
      .Select(d => new DynamicContentDTO(d))
      .ToLookup(x => x.Name);

   return Ok(dynContentList);
}