## 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.
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@app.route("%s/functions/<function>/aliases/<name>" % API_PATH_ROOT, methods=["DELETE"])
def delete_alias(function, name):
    region = LambdaRegion.get()
    arn = func_arn(function)
    if arn not in region.lambdas:
        return not_found_error(arn)
    lambda_details = region.lambdas.get(arn)
    if name not in lambda_details.aliases:
        return not_found_error(msg="Alias not found: %s:%s" % (arn, name))
    lambda_details.aliases.pop(name)
    return jsonify({})
@app.route("/<version>/functions/<function>/concurrency", methods=["GET", "PUT", "DELETE"])
def function_concurrency(version, function):
    region = LambdaRegion.get()
    
    
    
    arn = func_arn(function)
    lambda_details = region.lambdas.get(arn)
    if not lambda_details:
        return not_found_error(arn)
    if request.method == "GET":
        data = lambda_details.concurrency
    if request.method == "PUT":
        data = json.loads(request.data)
        lambda_details.concurrency = data
    if request.method == "DELETE":
        lambda_details.concurrency = None
        return Response("", status=204)