Does ADODB.Stream chunks conflicts with Response.Buffer?

Question

I use the follwoing code to push a large ZIP file to the client using vbscript (Classic asp). I am not sure how objStream.Read(10240) works? Does it send data to the client in chunks (or loads the file in memory chunks)? Should I also use Response.buffer= true (or false?) or those chunks with response.flush automatically release the server buffer size?

Set objStream = Server.CreateObject("ADODB.Stream")
objStream.Type = 1 'adTypeBinary
objStream.Open
objStream.LoadFromFile(server.mappath("test.zip"))

Response.ContentType = "application/zip"
Response.Addheader "Content-Disposition", "attachment; filename=test.zip"

do while not objStream.EOS
    response.binarywrite objStream.Read(10240)
    Response.Flush
loop