Αργεί να ανοίξει η ιστοσελίδα όταν η σύνδεση δεν είναι καλή.

Here Αργεί means it takes a long time or it is slow.

It comes from the verb αργώ, which can mean:

• to be late
• to take time
• to be slow

In this sentence, it does not mean that someone is late in the usual sense. It means the website is slow to open.

In Greek, να is often used where English would use an infinitive such as to open, to go, to finish, and so on.

Since Modern Greek does not really use an infinitive the way English does, it uses:

• να + verb form

So:

• αργεί να ανοίξει = it is slow to open / it takes a long time to open

This is a very common pattern:

• Αργεί να έρθει = He is taking a long time to come
• Αργεί να τελειώσει = It is taking a long time to finish

Because after να, Greek often chooses between different verb aspects.

Here ανοίξει is the perfective form, often called the aorist subjunctive in learner-friendly grammar. It presents the action as a whole event:

• να ανοίξει = to open, seen as one complete action

That fits well with the idea it takes a long time for the website to open.

If you said να ανοίγει, that would sound more like an ongoing or repeated process, which is not what this sentence is focusing on.

So:

• αργεί να ανοίξει = it is slow to get opened / it takes time to open

Greek word order is more flexible than English word order.

English normally wants:

• The website takes a long time to open

Greek can say either:

• Η ιστοσελίδα αργεί να ανοίξει
• Αργεί να ανοίξει η ιστοσελίδα

Both are correct.

Putting the verb first can sound natural and can slightly emphasize the delay itself:

• Αργεί... = It takes a long time...

So the subject η ιστοσελίδα appears later, but it is still the subject of the sentence.

Literally, ιστοσελίδα can mean webpage. However, in everyday Greek, many speakers also use it for website in general.

More precise distinctions are:

• ιστοσελίδα = webpage
• ιστότοπος = website

But in normal usage, ιστοσελίδα is very often used where English would say website.

So in this sentence, understanding it as the website is completely natural.

όταν means when.

In this sentence, όταν η σύνδεση δεν είναι καλή means:

• when the connection is not good

Greek uses the present tense here because this is a general situation or habitual truth:

• whenever the connection is bad, the website opens slowly

So this is not about one single future event. It is about what generally happens.

Greek uses the definite article much more often than English.

So Greek often says:

• η ιστοσελίδα
• η σύνδεση

where English may say:

• the website
• the connection

or even sometimes just:

• website
• connection

In Greek, using the article with nouns is very normal, especially when talking about a specific thing or a thing understood from context.

Because καλή has to agree with η σύνδεση.

The noun σύνδεση is:

• feminine
• singular
• nominative here

So the adjective must also be feminine singular:

• καλή = good, feminine singular

Compare:

• ο καιρός είναι καλός = the weather is good
• η σύνδεση είναι καλή = the connection is good
• το σήμα είναι καλό = the signal is good

This is standard adjective agreement in Greek.

In Greek, δεν is the normal negation used before verbs in indicative statements.

So:

• είναι = is
• δεν είναι = is not

This is the normal placement:

• Δεν καταλαβαίνω = I do not understand
• Δεν ξέρω = I do not know
• Η σύνδεση δεν είναι καλή = The connection is not good

So δεν simply goes directly before the finite verb.

Not in the same way.

English often uses a dummy it:

• It takes a long time for the website to open

Greek does not need that kind of placeholder subject here. The real subject is:

• η ιστοσελίδα

So Greek says, more directly:

• The website is slow to open
• Αργεί να ανοίξει η ιστοσελίδα

There is no extra word corresponding to English dummy it.

Yes. ανοίγω literally means open, but in computer and internet contexts it is often used much like English open:

• open a file
• open a page
• open a website

In practice, this can overlap with the idea of load or come up on the screen.

A speaker might also say:

• Αργεί να φορτώσει η ιστοσελίδα = The website is slow to load

That version focuses more specifically on loading.
The original sentence with να ανοίξει is still natural and understandable.

Yes, absolutely.

Both are correct:

• Αργεί να ανοίξει η ιστοσελίδα
• Η ιστοσελίδα αργεί να ανοίξει

The difference is mostly one of word order and emphasis, not basic meaning.

A learner will often find Η ιστοσελίδα αργεί να ανοίξει easier to understand at first because it follows a more English-like subject-first order.

A helpful breakdown is:

• Αργεί = takes a long time / is slow
• να ανοίξει = to open
• η ιστοσελίδα = the website
• όταν = when
• η σύνδεση = the connection
• δεν είναι = is not
• καλή = good

So very literally, it is something like:

• Is slow to open the website when the connection is not good

More natural English would be:

• The website takes a long time to open when the connection is not good
• The website is slow to open when the connection is bad

Yes. It sounds natural and everyday.

It is a normal way to describe a common technical problem.
A Greek speaker might also use slightly different wording, such as:

• Η ιστοσελίδα αργεί να ανοίξει όταν η σύνδεση δεν είναι καλή
• Η ιστοσελίδα αργεί να φορτώσει όταν η σύνδεση δεν είναι καλή
• Όταν η σύνδεση δεν είναι καλή, η ιστοσελίδα αργεί να ανοίξει

All of these are natural, with only small differences in focus or style.