## 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.
self.assertEqual(1, len(result))
    def test_delete_event_source_mapping(self):
        region = lambda_api.LambdaRegion.get()
        with self.app.test_request_context():
            region.event_source_mappings.append({"UUID": self.TEST_UUID})
            result = lambda_api.delete_event_source_mapping(self.TEST_UUID)
            self.assertEqual(self.TEST_UUID, json.loads(result.get_data()).get("UUID"))
            self.assertEqual(0, len(region.event_source_mappings))
    def test_invoke_RETURNS_415_WHEN_not_json_input(self):
        with self.app.test_request_context() as context:
            context.request._cached_data = "~notjsonrequest~"
            response = lambda_api.invoke_function(self.FUNCTION_NAME)
            self.assertEqual("415 UNSUPPORTED MEDIA TYPE", response.status)
    def _request_response(self, context):
        context.request._cached_data = "{}"
        context.request.args = {"Qualifier": "$LATEST"}
        context.request.environ["HTTP_X_AMZ_INVOCATION_TYPE"] = "RequestResponse"
        self._create_function(self.FUNCTION_NAME)
    @mock.patch("localstack.services.awslambda.lambda_api.run_lambda")
    def test_invoke_plain_text_response(self, mock_run_lambda):
        with self.app.test_request_context() as context:
            self._request_response(context)
            mock_run_lambda.return_value = "~notjsonresponse~"
            response = lambda_api.invoke_function(self.FUNCTION_NAME)
            self.assertEqual("~notjsonresponse~", 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_plain_text_response(self, mock_run_lambda):