pasokon no ugoki ga osokatta node, itido saikidousita.

It has two parts:

• パソコンの動きが遅かったので = because the computer was running slowly / because the computer’s performance was slow
• 一度再起動した = I restarted it once

So the pattern is:

[reason] ので, [result/action]

Japanese often puts the reason first and the main action second.

の connects nouns. Here it shows that 動き belongs to or relates to パソコン.

So:

• パソコン = computer
• 動き = movement, operation, performance
• パソコンの動き = the computer’s movement/operation/performance

In natural English, this often becomes something like the computer was slow or the computer was running slowly, even though Japanese uses the noun 動き.

Not necessarily. For machines, computers, apps, and software, 動き often means:

• how something runs
• responsiveness
• performance
• operation

So パソコンの動きが遅い does not usually mean the computer is physically moving slowly. It means the computer is sluggish or slow to respond.

Because 動き is the thing being described by 遅かった.

• 動きが遅かった = the movement/performance was slow

With adjectives like 遅い, the thing that has that quality is often marked by が.

Here, が is natural because the sentence is simply describing the computer’s performance as slow.

You could sometimes see は in other contexts, but が is the neutral choice here.

遅かった is the past form of the い-adjective 遅い.

Formation:

• 遅い → remove い → add かった
• 遅かった

So:

• 遅い = is slow
• 遅かった = was slow

The speaker is talking about the condition at that time: the computer was slow, so they restarted it.

Because the reason happened in the past relative to the action.

The logic is:

• the computer was slow
• so I restarted it

That is why 遅かったので sounds natural.

If you said 遅いので, it would sound more like because it is slow or because it’s slow in a more present/general sense.

ので means because or since.

In many cases, ので and から can both express a reason, but there is a nuance difference:

• ので = softer, more explanatory, more objective
• から = more direct, more assertive

So:

• 遅かったので、一度再起動した。 = Because it was slow, I restarted it once.
• 遅かったから、一度再起動した。 = Because it was slow, I restarted it once.

Both are correct, but ので sounds a little gentler and more matter-of-fact.

一度 literally means one time or once.

So 一度再起動した means:

• restarted it once
• tried restarting it once

In context, this often means the speaker took the step of rebooting it one time to see if that would help.

Because Japanese often omits things that are obvious from context.

The full idea is basically:

• パソコンを一度再起動した

But since the sentence is already about the computer, Japanese can leave パソコンを out.

This is very common. If the listener can easily tell what was restarted, the object is often omitted.

再起動する means to restart or to reboot.

So:

• 再 = again
• 起動 = startup / boot-up
• 再起動する = restart, reboot

再起動した is the past form:

• restarted
• rebooted

In computer-related contexts, rebooted is often a very natural translation.

This sentence is in the plain style.

• 再起動した = plain past
• 再起動しました = polite past

Plain style is common in casual conversation, diary-style writing, explanations, and many textbook example sentences.

If you wanted to make the whole sentence polite, you could say:

• パソコンの動きが遅かったので、一度再起動しました。

Yes. Japanese often leaves out the subject when it is clear from context.

In English, we would usually say:

• I restarted it once
• or So I restarted it once

In Japanese, the I is simply understood.

So the speaker is most likely saying that they restarted the computer.

Those spaces are usually just for learners.

Normal Japanese writing does not usually put spaces between words like this. It would normally be written as:

パソコンの動きが遅かったので、一度再起動した。

Textbooks and learning materials often add spaces to make the sentence structure easier to see.