Trigger performance tuning - sql-server

Question

I'm running SQL Server 2008 R2 and I have a trigger that inserts into a table where asql agent job then kicks off every 10 sec's to run a sp to send an email notification. The problem that I'm running into is it appears that when a large number of inserts happen simultaneously the notifications can hang up and not get sent out for several minutes (sometimes as long as an hour) after the insert happens.The tb_BatchEmail only receives a few inserts (2-3) at a time, it's the Orders tables that can have several dozen inserts happen at once. So my question is - Is this the best way to setup this type of trigger or is there a better way that is more efficient and won't lag behind when loads of table inserts happen at once?
Here is the trigger:
ALTER TRIGGER [dbo].[VoceraOeOrders] ON [dbo].[Orders]
AFTER INSERT
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO dbo.tb_BatchEmail (
BatchEmailID
,[To]
,Body
,[Subject]
,[Profile]
,OrderID
,OrderDateTime
,SentDateTime
)
SELECT '0'
,'some_email'
,CASE
WHEN RoomTreatmentID IS NULL
THEN 'No Room#'
ELSE RoomTreatmentID
END + '-' + OrderedProcedureName
,CASE
WHEN Category = 'US'
THEN 'Stat Ultra Sound'
WHEN Category = 'NUC'
THEN 'Stat Nuclear'
WHEN Category = 'ECHO'
THEN 'Stat Echo'
WHEN Category = 'CT'
THEN 'Stat C T'
WHEN Category = 'MRI'
THEN 'Stat M R I'
WHEN Category = 'XRAY'
THEN 'Stat Xray'
ELSE 'Stat Order Alerts'
END
,'Alert'
,OrderID
,OrderDateTime
,NULL
FROM inserted i
INNER JOIN dbo.Patients pat
ON pat.VisitID = i.VisitID
AND pat.SourceID = i.SourceID
WHERE Priority = 'STAT'
AND Category IN ('CT', 'MRI', 'XRAY', 'US', 'NUC', 'ECHO')
AND CurrentLocationID = 'ED'
END
And here is the sp that is set to kick off every 10 seconds via server agent job:
ALTER PROCEDURE [dbo].[sp_SendVoceraMail]
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE #Id INT
DECLARE #To VARCHAR(250)
DECLARE #Body VARCHAR(250)
DECLARE #Subject VARCHAR(50)
DECLARE #ProfileName VARCHAR(20)
WHILE (
SELECT count(*)
FROM tb_BatchEmail
WHERE BatchEmailID = 0
) > 0
BEGIN
SELECT TOP 1 #Id = Id
,#To = [To]
,#Body = Body
,#Subject = [Subject]
,#ProfileName = [Profile]
FROM tb_BatchEmail
WHERE BatchEmailID = 0
EXEC msdb.dbo.sp_send_dbmail #recipients = #To
,#body = #Body
,#subject = #Subject
,#profile_name = #ProfileName
UPDATE tb_BatchEmail
SET BatchEmailID = 1
,SentDateTime = GETDATE()
WHERE Id = #Id
END
END