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Message: <blockquote data-quote="Robert Klemme" data-source="post: 4506871">This approach is quite inefficient in two ways:- you use + for string concatenation which constantly creates new objectsand throws old ones away.  Better use <<- You need to keep the whole file in mem while with a streaming approach(reading and writing a chunk at a time only) you can deal with arbitrarysized files without worrying about memory.You should use mode "wb" - even if on Linux."wb" again...Better use #read and #write instead of gets!You want TCPServer here.# untestedsrv = TCPServer.new('localhost',9191)while ( sess = srv.accept )Thread.new(sess) do |session|File.open("lighter.jpg", "rb") |io|session.write(io.read(1024))endendendHope I could give some valuable hints.Kind regardsrobert</blockquote>