[🐛 Bug]: Critically slow file transfer from Node to host for large files

[ilya-corp]

Description

Downloading of large files (approx. 500 Mb) from Selenium Grid Node is critically slow.
To reproduce you need to open browser at node and try to download an large file from server. In my case downloading of 500Mb from server to node takes approx. 10 seconds and uploading file from node to host - 250 seconds.

Potentially problem placed in the following code:

selenium/java/src/org/openqa/selenium/remote/RemoteWebDriver.java

Line 727 in da9dfdc

public void downloadFile(String fileName, Path targetLocation) throws IOException {

Response response = execute(DriverCommand.DOWNLOAD_FILE, Map.of("name", fileName));
    String contents = ((Map<String, String>) response.getValue()).get("contents");
    Zip.unzip(contents, targetLocation.toFile());

Encoding of 500Mb to Base64 takes a lot of time and born approx. X1.5 volume size (750Mb). Additionally, processing os large GSON also requires many processor resources and memory. Reverse encoding from Base64 to bytes also requires time.
The idea is to use raw bytes transferring without encoding.

Selenium 4.38

Reproducible Code

WebElement webElement = ...;
webElement.download();

Debugging Logs

no

[selenium-ci]

@ilya-corp, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide