Paging and specification filtering timeout issue.

We have 12k+ filters and clicking on pagenumber or filtering by attributes takes long time or gives timeout error. When I run stored procedure in SSMS it takes just 4 seconds. This is the link to category page
http://callapg.vainc.net/sealing%2Fo-rings. Can you please suggest how we can improve performance?

Below is the log rom admin panel

System.Data.SqlClient.SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception (258): The wait operation timed out
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteReader(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.BufferlessMoveNext(DbContext _, Boolean buffer)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider._TrackEntities[TOut,TIn](IEnumerable`1 results, QueryContext queryContext, IList`1 entityTrackingInfos, IList`1 entityAccessors)+MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext()
   at System.Collections.Generic.List`1.AddEnumerable(IEnumerable`1 enumerable)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at SevenSpikes.Nop.Plugins.AjaxFilters.Services.ProductServiceNopAjaxFilters.SearchProductsInternal(IList`1 categoryIds, SpecificationFilterModelDTO specifiationFilterModelDTO, AttributeFilterModelDTO attributeFilterModelDTO, ManufacturerFilterModelDTO manufacturerFilterModelDTO, VendorFilterModelDTO vendorFilterModelDTO, Int32 pageIndex, Int32 pageSize, Int32 manufacturerId, Int32 vendorId, Int32 storeId, Nullable`1 featuredProducts, Nullable`1 priceMin, Nullable`1 priceMax, Int32 productTagId, String keywords, Boolean searchDescriptions, Boolean searchSku, Boolean searchProductTags, Int32 languageId, ProductSortingEnum orderBy, Boolean showHidden, Boolean onSale, Boolean inStock)
   at SevenSpikes.Nop.Plugins.AjaxFilters.Services.ProductServiceNopAjaxFilters.SearchProducts(IList`1 categoryIds, SpecificationFilterModelDTO specifiationFilterModelDTO, AttributeFilterModelDTO attributeFilterModelDTO, ManufacturerFilterModelDTO manufacturerFilterModelDTO, VendorFilterModelDTO vendorFilterModelDTO, Int32 pageIndex, Int32 pageSize, Int32 manufacturerId, Int32 vendorId, Int32 storeId, Nullable`1 featuredProducts, Nu

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