Streamlining a Late 2013 MacBook Pro
Hello Apple Community. I have a Late 2013 MacBook Pro that continues to serve me well, its only hardware problem apparently being a single bad pixel. I don't have a general speed problem with it, but there's seems to be something about it causing slow download speeds and pauses in videos with the house's wifi connection, which is working well with all the other devices in the house. Sometimes it will whip along at a couple of megabytes a second, but many other times it will slow down to a crawl and a download will take forever or I can't watch something.
I had previously suspected that a kernel_task showing in Activity Monitor was causing slowdowns, and I recently noticed that kernel_task was showing nearly 140 threads, which made it again seem a likely culprit. So I searched on <kernel_task "Activity Monitor" (threads OR GB)> and found a discussion at kernel task running at 110 threads - Apple Community in which someone found help in getting his 15" Retina MBP speeded up. I'm looking for the same kind of help, though in combination with a general project of clearing up disk space, which was recommended as a means of speeding up a Mac. I have a new 5TB Seagate disk that should enable this, but I want to do it in an optimal manner regarding partitioning and so forth.
There are too many questions involved to handle all of this in one fell swoop, so perhaps I can start with just formatting and partitioning the new 5TB disk. I have with a 500GB internal disk and a 1TB external disk divided into two 500GB partitions, one of which I use for a clone backup and the other for archiving. I've had a certain inclination to wipe the 1TB and use it for Time Machine (which I used to use but haven't for years, not having a big enough backup disk on hand), since it seems appropriately sized for that. But I don't think I'll do this, since with a 5TB disk I should be able to have both Time Machine connected and my archives online at the same time.
I like round numbers and simplicity, so how about dividing the 5TB into five 1TB partitions? This would be with one of these for the Time Machine backup, another for archived stuff that I could back up to the 1TB disk, and three that I don't need for anything. :-) OR it could be 1+1+3, or 1+1+1.5+1.5, or 1+1+2+1, or various other possibilities. Any suggestions?
In any event there's an unwelcome additional question of disk format. The Seagate quick start guide says, "For Time Machine, the hard drive must be formatted HFS+ for Mac." It's nice to be informed that I can't leave it in ExFAT (which I wouldn't have done anyway), but Disk Utility doesn't propose a single simple HFS+ format. I see that APSF is for MacOS 10.13 and up, and I'm on 10.14 Mojave with this 2013 MacBook Pro. I don't care about encryption or case sensitivity, so I suppose it's a choice between simple APSF and simple Mac OS Extended. APSF might be a safe guess even without an indication that it's HFS+ per the Seagate indication, but I want to act on the side of caution and so am following the advice of someone in the above-mentioned thread and asking first. I'll be getting into deletions later, but want to start off by making sure I have the 5TB disk optimally set up as regards partitions and format. Thanks.
MacBook Pro 13″, macOS 10.14