PHP Upload increased upload / processing time - php

Question

I am trying to upload files to server using PHP.
I created a simple file input and a submit button and wrote the PHP function to handle that request.
Initially I tried using this library https://github.com/Gargron/fileupload which worked fine, but I thought I might be missing something so I wrote the php code myself.
It is uploading small files instantly. By small I mean maximum 1Mb.
I am looking to upload files up to 2-3GB or maybe bigger.
So I tried an 150Mb file which transferred nearly instantly as I have a very high uplink bandwidth, so it took few seconds to transfer it, but it never never arrived on the server, I haave no idea why, when I am tried with small files, they go directly on the server folder instantly.
I tried with a 25Mb file and the browser showed that the upload is 100% in less than 5 seconds, but then it took 4 minutes for the file to get on the destination folder on the server.
I am using Ubuntu 20.04 LTS, Apache2, PHP v7.3.20.
I checked PHP ini and I increased post_max_size and upload_max_filesize as per my requirements, so I am not sure what I am missing.
HTML Form
<form action="pages/upload-video" enctype="multipart/form-data" method="post" accept-charset="utf-8">
<input type="file" name="fileToUpload">
<br><br>
<input type="submit" value="upload">
</form>
PHP function
public function upload_video() {
$target_dir = VIDEO_PATH;
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "The file " . basename($_FILES["fileToUpload"]["name"]) . " has been uploaded.";
} else {
echo "Sorry, there was an error uploading your file.";
}
}
}
Next I tried to leave only
public function upload_video() {
print_r($_FILES['fileToUpload']);
}
And it takes so much time to execute the function. Not sure whats going on here. Never experienced this before.