Can we make the DwinHs Inno Setup download plugin work faster?

DwinHs has a DwinsHs_Data_Buffer_Length macro. I have set it to a value of 8192 but the download speeds are still rather slow.

For example, I have a 200 MBit connection and the file is 25 MB. It takes two and a half minutes to download.

I have read through some of the answers here:

What is the best memory buffer size to allocate to download a file from Internet?

It suggests a 16K buffer instead. Either way, is there any way we can use a maximum buffer length with Pascal given the user system?

Browsers download faster so why can’t we here in Inno Setup?

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Example

[ISPP]
#define HelpDocSetupURL "https://www.publictalksoftware.co.uk/downloads/PublicTalksHelpDocumentationSetup.exe"

[Setup]
AppID = TestID
AppName = Test App
OutputBaseFilename = My_Test_App_Setup
AppVersion = 1.0
DefaultDirName = {pf}\MyTestApp
DefaultGroupName = My Test App

[Tasks]
Name: "downloadhelp"; Description: "Task Desc"; GroupDescription: "Group Desc";

[Files]

Source: "{tmp}\HelpDocSetup.exe"; \
    DestDir: "{app}"; \
    Flags: external deleteafterinstall; \
    Tasks: downloadhelp; \
    Check: DwinsHs_Check( ExpandConstant('{tmp}\HelpDocSetup.exe'), '{#HelpDocSetupURL}', 'My_Setup', 'Get', 0, 0 )

[Code]
program Setup;

#define DwinsHs_Use_Predefined_Downloading_WizardPage
#define DwinsHs_Data_Buffer_Length 8192
#include "dwinshs.iss"

procedure InitializeWizard();
begin
  DwinsHs_InitializeWizard(wpPreparing);
end;

procedure CurPageChanged(CurPageID: Integer);
begin
  DwinsHs_CurPageChanged(CurPageID, nil, nil);
end;

function ShouldSkipPage(CurPageId: Integer): Boolean;
begin
  Result := False;
  DwinsHs_ShouldSkipPage(CurPageId, Result);
end;

function BackButtonClick(CurPageID: Integer): Boolean;
begin
  Result := True;
  DwinsHs_BackButtonClick(CurPageID);
end;

function NextButtonClick(CurPageID: Integer): Boolean;
begin
  Result := True;
  DwinsHs_NextButtonClick(CurPageID, Result);
end;

procedure CancelButtonClick(CurPageID: Integer; var Cancel, Confirm: Boolean);
begin
  DwinsHs_CancelButtonClick(CurPageID, Cancel, Confirm);
end;

The software author got back to me about this issue and proposed:

You can try to set the cache size to 16384, 32768 or 655536.

So I set it to:

#define DwinsHs_Data_Buffer_Length 655536

The results are much better:

As you can see, only 10 seconds.

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I don't know what impact such a cache value would have for those who had a slower internet connection.