Add --fast option

src/main.rs

@@ -182,6 +182,11 @@ fn main() {
                     Err(_) => Err("Invalid option for filters".to_owned()),
                 }),
         )
+        .arg(
+            Arg::new("fast")
+                .help("Use fast filter evaluation")
+                .long("fast"),
+        )
         .arg(
             Arg::new("compression")
                 .help("zlib compression level (1-12) - Default: 11")
@@ -442,6 +447,10 @@ fn parse_opts_into_struct(
         opts.alphas.insert(AlphaOptim::Left);
     }
 
+    if matches.is_present("fast") {
+        opts.fast_evaluation = true;
+    }
+
     if matches.is_present("backup") {
         opts.backup = true;
     }