## Problem
Currently, even if `LAMBDA_REMOTE_DOCKER=1`, we unzip the zip files in the directory they are in, which is usually /var/lib/localstack, which usually has a bind mount to the host.
On docker desktop, due to the use of grpc-FUSE (on macos), this can be very slow, about 200 times slower than on volumes / directly on the host. With experimental virtio filesystem enabled (also on macos), this can be reduced to about 30 times as slow, but still problematic.
This means a lambda may take a lot of time processing, for each additional layer some more. This especially affects nodejs lambdas with huge node_modules folders.

## Probable solution
At least if `LAMBDA_REMOTE_DOCKER=1`, we should leave the initial zip files on the bind mount (for persistence etc), but the working directories after unzipping should be located on non-bind mounts, to speed up the IO for unzipping.
with self.app.test_request_context() as context:
            self._request_response(context)
            mock_run_lambda.return_value = ""
            response = lambda_api.invoke_function(self.FUNCTION_NAME)
            self.assertEqual("", response[0])
            self.assertEqual(200, response[1])
            headers = response[2]
            self.assertEqual("text/plain", headers["Content-Type"])
    @mock.patch("localstack.services.awslambda.lambda_api.run_lambda")
    def test_invoke_empty_map_json_response(self, mock_run_lambda):
        with self.app.test_request_context() as context:
            self._request_response(context)
            mock_run_lambda.return_value = "{}"
            response = lambda_api.invoke_function(self.FUNCTION_NAME)
            self.assertEqual(b"{}\n", response[0].response[0])
            self.assertEqual(200, response[1])
            self.assertEqual("application/json", response[0].headers["Content-Type"])
    @mock.patch("localstack.services.awslambda.lambda_api.run_lambda")
    def test_invoke_populated_map_json_response(self, mock_run_lambda):
        with self.app.test_request_context() as context:
            self._request_response(context)
            mock_run_lambda.return_value = '{"bool":true,"int":1}'
            response = lambda_api.invoke_function(self.FUNCTION_NAME)
            self.assertEqual(b'{"bool":true,"int":1}\n', response[0].response[0])
            self.assertEqual(200, response[1])
            self._assert_contained({"Content-Type": "application/json"}, response[0].headers)
    @mock.patch("localstack.services.awslambda.lambda_api.run_lambda")
    def test_invoke_empty_list_json_response(self, mock_run_lambda):
        with self.app.test_request_context() as context:
            self._request_response(context)