Code Optimizations suggestions

Feedback from our Azure Cloud environment, attaching call stack.

Memory:
1) 6 % of your Memory was spent in List.ForEach called from EPiServer.ContentApi.Core.Serialization.Internal.ContentConvertingService.ConvertToContentApiModel


2) 3 % of your Memory was spent in ResourceInvoker.InvokeNextResourceFilterAwaitedAsync called from EPiServer.Framework.DependencyInjection.Internal.VisitorGroupResourceFilter.OnResourceExecutionAsync.

CPU:
1) 2 % of your CPU was spent in ControllerActionInvoker.InvokeNextActionFilterAwaitedAsync called from EPiServer.ContentApi.Core.Internal.ContentLanguageFilterAttribute.OnActionExecutionAsync.

2) 1 % of your CPU was spent in ResourceInvoker.InvokeNextResourceFilterAwaitedAsync called from EPiServer.Framework.DependencyInjection.Internal.VisitorGroupResourceFilter.OnResourceExecutionAsync

3) 1% of your CPU was spent in ControllerActionInvoker.InvokeNextActionFilterAwaitedAsync called from EPiServer.ContentApi.Core.OutputCache.OutputCacheFilterAttribute.OnActionExecutionAsync.