Migrating to Exchange 2013 from 2007. In Coexistence and receiving routine event errors.

We are in the process of upgrading our Exchange environment to 2013 and are currently running 2013/2007 in coexistence. The 2013 server has only 4 mailboxes on its database that we are testing with before migrating everyone and taking 2007 offline. The server is running Mailbox and CAS roles. Currently mail flow is working, but we receive the following event errors routinely. Also, OWA works but the login is slow. I’m looking to get these ironed out before moving over users. Any insight is greatly appreciated because I'm stumped. I have managed Exchange since version 5 and this is the first time I've had issues that were not easily resolved. 
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Source: MSExchange Autodiscover 
Event ID: 1
Task Category: Web
Unhandled Exception "Active Directory operation failed on Global Catalog. This error could have been caused by user input or by the Active Directory server being unavailable. Please retry at a later time. Additional information: Active directory response: The operation was aborted because the client side timeout limit was exceeded. ." 
Stack trace: Microsoft.Exchange.Data.Directory.ADPossibleOperationException: Active Directory operation failed on Global Catalog. This error could have been caused by user input or by the Active Directory server being unavailable. Please retry at a later time. Additional information: Active directory response: The operation was aborted because the client side timeout limit was exceeded. . ---> 
System.DirectoryServices.Protocols.LdapException: The operation was aborted because the client side timeout limit was exceeded.     
at System.DirectoryServices.Protocols.LdapConnection.ConstructResponse(Int32 messageId, LdapOperation operation, ResultAll resultType, TimeSpan requestTimeOut, Boolean exceptionOnTimeOut)    
at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout)    
at Microsoft.Exchange.Data.Directory.PooledLdapConnection.SendRequest(DirectoryRequest request, LdapOperation ldapOperation, Nullable`1 clientSideSearchTimeout, IActivityScope activityScope, String callerInfo)    
at Microsoft.Exchange.Data.Directory.ADDataSession.InternalFind[TResult](ADObjectId rootId, String optionalBaseDN, ADObjectId readId, QueryScope scope, QueryFilter filter, SortBy sortBy, Int32 maxResults, IEnumerable`1 properties, Boolean includeDeletedObjects)   --- End of inner exception stack trace ---    
at Microsoft.Exchange.Data.Directory.ADDataSession.AnalyzeDirectoryError(PooledLdapConnection connection, DirectoryRequest request, DirectoryException de, Int32 totalRetries, Int32 retriesOnServer) 
at Microsoft.Exchange.Data.Directory.ADDataSession.InternalFind[TResult](ADObjectId rootId, String optionalBaseDN, ADObjectId readId, QueryScope scope, QueryFilter filter, SortBy sortBy, Int32 maxResults, IEnumerable`1 properties, Boolean includeDeletedObjects)   
at Microsoft.Exchange.Data.Directory.SystemConfiguration.ADConfigurationSession.GetFederatedOrganizationId(ADObjectId rootId)    
at Microsoft.Exchange.Data.Storage.ExchangePrincipalExtensions.ReadSharingPolicy(ExchangePrincipal exchangePrincipal)    
at Microsoft.Exchange.Autodiscover.ConfigurationSettings.UserSettingsProvider.GetUserSettings(HashSet`1 requestedSettings, IBudget budget)    at Microsoft.Exchange.Autodiscover.WCF.ADQueryResult.CreateResponseFromQueryResult(IBudget budget) 
at Microsoft.Exchange.Autodiscover.WCF.ADQueryResult.CreateResponse(IBudget budget)    
at Microsoft.Exchange.Autodiscover.WCF.GetUserSettingsCommandBase.Execute()    
at Microsoft.Exchange.Autodiscover.WCF.GetUserSettingsRequestMessage.ExecuteCommand(IIdentity callerIdentity, CallContext callContext)    
at Microsoft.Exchange.Autodiscover.WCF.GetUserSettingsRequestMessage.ExecuteGetUserSettingsCommand(IPrincipal callingPrincipal, CallContext callContext)    
at Microsoft.Exchange.Autodiscover.WCF.GetUserSettingsRequestMessage.Execute()
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Source: Perflib
Event ID: 1023
Task Category: None
Windows cannot load the extensible counter DLL ASP.NET_64_2.0.50727. The first four bytes (DWORD) of the Data section contains the Windows error code.
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Source: Perflib
Event ID: 1023
Task Category: None
Windows cannot load the extensible counter DLL ASP.NET_2.0.50727. The first four bytes (DWORD) of the Data section contains the Windows error code.
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Source: MSExchangeTransportDelivery
Event ID: 1040
Task Category: SmtpReceive
The SMTP availability of the Receive connector Default Mailbox Delivery was low (0 percent) in the last 15 minutes.
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Source: MSExchange ADAccess 
Event ID: 4028
Task Category: General
Process w3wp.exe (AutoDisc) (PID=16568). The budget for user 'Sid~Domain\user~Ews~false' has been unlocked.
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Source: MSExchange ADAccess
Event ID: 4101
Task Category: General
Process w3wp.exe (AutoDisc) (PID=16568). The following actions exceeded maximum time limit:  CostType: CAS, Key: -9223372036854767960, Limit: 00:05:00, Elapsed: 00:17:56.8142620, Actions: 6, Description: Caller: LegacyBodyWriter.OnWriteBodyContents, ThreadID: 1071, PreCharge: 0ms, Snapshot: Owner:Sid~Domain\user~Ews~false,Conn:3,MaxConn:27,MaxBurst:300000,Balance:$null,Cutoff:-3000000,RechargeRate:900000,Policy:AllUsersEWSPolicy,IsServiceAccount:False,LiveTime:04:20:38.4884143
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Source: MSExchange Common
Event ID: 4999
Task Category: General
Watson report about to be sent for process id: 16568, with parameters: E12IIS, c-RTL-AMD64, 15.00.0847.032, w3wp#MSExchangeAutodiscoverAppPool, M.E.Data.Directory, M.E.D.D.Budget.CheckLeakedActions, M.E.D.Directory.LongRunningCostHandleException, e70, 15.00.0847.031. ErrorReportingEnabled: False
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Source: MSExchange Mid-Tier Storage
Event ID: 10006
Task Category: (10)
Active Manager Client experienced an AD timeout trying to lookup object 'Exchange Server' in 00:01:00.
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