SQL Server Filestream - Delete "speed"

Question

I'm working with the filestream datatype for the first time (SQL Server 2008) and I'm running into issues when I am doing some fast insert/deletes. Basically the speed at which the files are actually removed from the FileSystem is way slower then the insert/delete speed even if I invoke the garbage collector manually (As far as I know the CHECKPOINT is supposed to invoke the garbage collector).

The code below illustrate the problem - It takes roughly 30 seconds to executes, but you have to wait quite a few minutes for the last file to be deleted from the filesystem (When I look up the C:\FSTest\Files folder)

Is there any way to speed up the garbage collector? (It seems to roughly deletes 20 files every 10 seconds - which makes me believe that if I store/delete more then 2 records per second I will eventually end up filling the hard drive)

Thank you

CREATE DATABASE FSTest ON PRIMARY
    (NAME = FSTest_data, FILENAME = N'C:\FSTest\FSTest_data.mdf'),
FILEGROUP FSTestFileGroup CONTAINS FILESTREAM
    (NAME = FSTestFiles,FILENAME = N'C:\FSTest\Files')
LOG ON 
    (NAME = 'FSTest_log', FILENAME = N'C:\FSTest\FSTest_log.ldf');
GO

USE FSTest;
GO

CREATE TABLE FSTest (
    Guid UNIQUEIDENTIFIER ROWGUIDCOL NOT NULL UNIQUE DEFAULT NEWSEQUENTIALID(),
    Name VARCHAR (25),
    Data VARBINARY(MAX) FILESTREAM);
GO

ALTER DATABASE FSTest SET RECOVERY SIMPLE;
GO

SET NOCOUNT ON
DECLARE @test int
SET @test=0
WHILE @test<1000 BEGIN
    INSERT INTO FSTest(Name,Data) VALUES('test',CAST('abc' AS VARBINARY(MAX)))
    DELETE FROM FSTest WHERE Name='test'
    CHECKPOINT
    SET @test = @test+1
END

Update:

I tried the same for a longer period of time with a insert/delete speed closer to my needs and after 30 minutes of execution the same situation is observable: Files are created way faster then they get deleted.

SET NOCOUNT ON
DECLARE @test int
SET @test=0
WHILE @test<100000 BEGIN
    INSERT INTO FSTest(Name,Data) VALUES('test',CAST('abc' AS VARBINARY(MAX)))
    DELETE FROM FSTest WHERE Name='test'
    WAITFOR DELAY '00:00:00:200'
    CHECKPOINT
    SET @test = @test+1
END

Answer 1

After some more research (and thanks to Paul Randal's blog - lots of very detailed information surrounding filestream and garbage collection), once the rows are deleted and a checkpoint is executed, the files are put in a system table (Tombstone table), then every 10 seconds a process (Ghost Cleanup) runs and remove some items from that table (20 to be exact). So basically we are limited to 2 deletes/seconds and there seems to be no way (yet) to change this behavior.

Since I have a sustained 4 deletes per seconds I will need to find an alternative to filestream.

Thanks everyone for your inputs.