الشاشة دي صغيرة، عشان كده بقرا الرسالة على الكمبيوتر.

It is Egyptian Arabic.

A few clues:

• دي = Egyptian this for feminine nouns
• عشان كده = a very common Egyptian way to say so / that’s why
• بقرا = Egyptian-style present tense with بـ
• الكمبيوتر = common everyday wording in colloquial speech

A Modern Standard Arabic version would look different in several places.

A rough pronunciation is:

esh-shaasha di soghayyara, ʿashan kida baʔra er-risaala ʿala l-kombyuter.

A few notes:

• ʿ represents the Arabic letter ع
• ʔ is a glottal stop, like the break in uh-oh
• kida/keda are both common ways to write the same Egyptian pronunciation
• Informal transliterations vary a lot, so you may see slightly different spellings

دي means this for a feminine noun.

In Egyptian Arabic, demonstratives like ده / دي / دول usually come after the noun:

• الشاشة دي = this screen
• الراجل ده = this man
• البنات دول = these girls

That is different from English, where this comes before the noun.

Because in Arabic, present-tense sentences like X is Y often do not use a word for is.

So:

• الشاشة دي صغيرة literally looks like this screen small
• but it means This screen is small

This is very normal in both Egyptian Arabic and Modern Standard Arabic.

Because الشاشة is a feminine singular noun, so the adjective has to agree with it.

• شاشة is feminine
• so the adjective becomes صغيرة = small feminine singular

If the noun were masculine, you would usually use صغير instead.

Because صغيرة here is the predicate adjective, not part of the noun phrase.

Compare:

• الشاشة دي صغيرة = This screen is small
• الشاشة الصغيرة = the small screen

So in your sentence, صغيرة is describing the subject as the result of the sentence, not forming one big noun phrase.

عشان كده means so, therefore, or that’s why.

It is a very common Egyptian expression for giving a result:

• الشاشة دي صغيرة، عشان كده...
• This screen is small, so...

You can think of it as because of that or for that reason.

In Egyptian Arabic, بـ is commonly used to mark the present tense in everyday speech.

So:

• بقرا = I read / I’m reading

For a learner, the most useful rule is:

• بـ + verb is often the normal Egyptian present tense

Here it tells you the speaker is doing the action in the present.

Both can be seen, but بقرأ is the more careful spelling.

In informal writing, especially texting or casual online Arabic, people often leave out the hamza and write:

• بقرا

instead of:

• بقرأ

The pronunciation is still roughly baʔra.

So this is a very common informal spelling habit, not a different word.

Because ش and ر are sun letters.

When الـ comes before a sun letter, the ل sound disappears in pronunciation, and the next consonant is doubled.

So:

• الشاشة is pronounced esh-shaasha
• الرسالة is pronounced er-risaala

You still write الـ, but you do not pronounce the l there.

Because على is the natural preposition here in Egyptian Arabic.

So:

• على الكمبيوتر = on the computer / using the computer

This is one of those cases where Arabic and English prepositions do not match perfectly word-for-word. The best approach is to learn the whole phrase as a chunk.

Yes, a little. Arabic allows some flexibility, depending on emphasis.

For example, you could also say:

• بقرا الرسالة على الكمبيوتر عشان الشاشة دي صغيرة.

That means essentially the same thing, but the emphasis shifts a bit. The original sentence is already very natural and clear.