Even lag may not be your ISP.  It could be crappy wireless, too much distance from router to client.  Too many networks in your area.  Maybe just a crap router, from your provider with too many connections, etc.

If you really think it is your network, check your router for throughput(admin pages), run speed tests(like dslreports.com)... if you have a 1GB line like me, and you are only seeing 200mb of live traffic then you should not have bandwidth problems, unless you are being throttled by your provider.... then yeah, you need to talk to them.

or experiment by turning down your litecoin and bitcoin nodes, then spin up your moonlanders... don't want to get into an argument, but I don't see why anyone would want to run a full node all the time, especially for BTC, the bandwidth usage is too much imho(and I have fiber running right into my house).  If you have to choose between 20 moonlanders that could make you $$ and a BTC full node that is just running for altruistic reasons.. well.  You know, make a choice.

Anyway, not even sure this is a moonlander discussion at this point.  Good luck though.