Die oplaaispoed is hetsy hoog hetsy laag.

Oplaaispoed means upload speed.

It is written as one word because Afrikaans, like Dutch and German, very often forms compound nouns by joining words together. Here:

• oplaai = to upload
• spoed = speed

So oplaaispoed is literally upload-speed.

This is very normal in Afrikaans. English often writes these as two words, but Afrikaans usually prefers one compound word.

Die here means the.

So:

• Die oplaaispoed = The upload speed

Afrikaans uses die as the definite article for all genders and for both singular and plural in many cases, so it is much simpler than English in that respect.

Hetsy ... hetsy ... means either ... or ... or sometimes whether ... or ..., depending on context.

In your sentence:

• hetsy hoog hetsy laag = either high or low

So the structure is:

• hetsy X hetsy Y = either X or Y

This is a fixed pairing. You use hetsy before both alternatives.

Because hetsy ... hetsy ... already contains the contrast between the two options.

So instead of saying something like hetsy hoog of laag, Afrikaans uses the paired structure:

• hetsy hoog hetsy laag

That whole pattern already means either high or low.

It is correct Afrikaans, but it sounds a bit formal, bookish, or careful.

In more everyday speech, many speakers would more naturally say:

• Die oplaaispoed is óf hoog óf laag.

So yes, your sentence is grammatical, but hetsy ... hetsy ... is not the most casual everyday choice.

Because Afrikaans main clauses normally place the finite verb in the second position.

Here the sentence is structured like this:

• Die oplaaispoed = subject
• is = finite verb
• hetsy hoog hetsy laag = complement

So:

• Die oplaaispoed is hetsy hoog hetsy laag.

This is normal Afrikaans word order.

Because they are being used predicatively, after the verb is.

In Afrikaans, adjectives often stay in their basic form when they come after a verb like is:

• Die huis is groot.
• Die internet is stadig.
• Die oplaaispoed is hoog.

So:

• hoog stays hoog
• laag stays laag

You would be more likely to see adjective endings in front of nouns, not after is.

Yes. In fact, that is often the more natural everyday alternative.

You could say:

• Die oplaaispoed is óf hoog óf laag.

That also means The upload speed is either high or low.

A useful distinction is:

• hetsy ... hetsy ... = more formal/literary
• óf ... óf ... = very common and natural in ordinary speech

No. It can link different kinds of alternatives, not just adjectives.

For example, it can connect:

• nouns
• adjectives
• clauses

Examples:

• Hetsy vandag hetsy môre = either today or tomorrow
• Hetsy per e-pos hetsy telefonies = either by email or by phone

So in your sentence it links two adjective-like descriptions, but the pattern is broader than that.

It is grammatically fine, but the meaning is a bit binary and somewhat formal.

It presents only two possibilities:

• high
• low

That can be fine if you are classifying something very simply. But in normal conversation, people might often say something more specific, depending on the context.

Still, as a grammar example of hetsy ... hetsy ..., it works well.

Yes. That is a very useful thing to know.

Depending on context, hetsy can often be understood as whether or as part of either ... or ....

So:

• hetsy hoog hetsy laag

can be thought of as:

• whether high or low
• or more naturally in English here, either high or low

That is why learners sometimes meet hetsy in slightly different-looking translations.