Removed the code to always push the request on the main thread and added autorelease pool to properly release objects created on the new thread.

src/SeriouslyOperation.m

@@ -61,19 +61,33 @@ - (id)initWithRequest:(NSURLRequest *)urlRequest handler:(SeriouslyHandler)handl
     return self;
 }
 
-- (void)start {
-    if (self.isCanceled || self.isFinished) return;
-
-    if (![NSThread isMainThread]) {
-        [self performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:NO];
-        return;
-    }
-
+- (void)main {
+
+	if (self.isCanceled || self.isFinished) return;
+
     KVO_SET(isExecuting, YES);
 
-    _connection = [[NSURLConnection alloc] initWithRequest:_urlRequest delegate:self];
+	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+
+	_connection = [[NSURLConnection alloc] initWithRequest:_urlRequest delegate:self];
     [_connection start];
+
+	if (![NSThread isMainThread]) {
+		//keep the thread alive while connection is executing
+		//without this NSURLConnection delegate is not called
+		NSRunLoop *theRL = [NSRunLoop currentRunLoop];
+		while ([self isExecuting] && [theRL runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]){
+			//nothing to do
+		}	
+	}
+
+	[pool drain];
+
+}
 
+- (void)start {
+
+	[self main];
 }
 
 - (void)cancel {