## 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.
del policy["PolicyName"]
    del policy["PolicyArn"]
    if len(policy["Statement"]) > 0 and description:
        iam_client.create_policy(
            PolicyName=policy_name,
            PolicyDocument=json.dumps(policy),
            Description=description,
        )
    elif len(policy["Statement"]) > 0:
        iam_client.create_policy(PolicyName=policy_name, PolicyDocument=json.dumps(policy))
    result = {
        "FunctionName": function,
        "Qualifier": qualifier,
        "StatementId": statement,
    }
    return jsonify(result)
@app.route("%s/functions/<function>/policy" % API_PATH_ROOT, methods=["GET"])
def get_policy(function):
    qualifier = request.args.get("Qualifier")
    policy = get_lambda_policy(function, qualifier)
    if not policy:
        return not_found_error("The resource you requested does not exist.")
    return jsonify({"Policy": json.dumps(policy), "RevisionId": "test1234"})
@app.route("%s/functions/<function>/invocations" % API_PATH_ROOT, methods=["POST"])
def invoke_function(function):
    """Invoke an existing function
    ---
    operationId: 'invokeFunction'
    parameters:
        - name: 'request'