experiment with reducing retained arena size

Author: karlseguin

src/browser/session.zig

@@ -89,7 +89,7 @@ pub const Session = struct {
         try parser.init();
 
         const page_arena = &self.browser.page_arena;
-        _ = page_arena.reset(.{ .retain_with_limit = 1 * 1024 * 1024 });
+        _ = page_arena.reset(.{ .retain_with_limit = 128 * 1024 });
 
         self.page = @as(Page, undefined);
         const page = &self.page.?;
@@ -128,7 +128,7 @@ pub const Session = struct {
         // it isn't null!
         std.debug.assert(self.page != null);
 
-        defer _ = self.browser.transfer_arena.reset(.{ .retain_with_limit = 1 * 1024 * 1024 });
+        defer _ = self.browser.transfer_arena.reset(.{ .retain_with_limit = 64 * 1024 });
 
         // it's safe to use the transfer arena here, because the page will
         // eventually clone the URL using its own page_arena (after it gets