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

Question

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?
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;

Answer 1

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