A hacky JS solution for finding the slowest steps in your Jenkins build

findlamerz.js

function findLamerz() {
    /*
     * Marks the slowest steps in your Jenkins Console output.
     * 1. Enable Timestamper: https://wiki.jenkins-ci.org/display/JENKINS/Timestamper
     * 2. Open your full Jenkins console output: http://TEH_JENKINS/job/TEH_BUILD_NAME/42/consoleFull
     * 3. Open the JS console of your browser and paste the whole function
     * 4. Run the following steps on the console, one after one: n = findLamerz(); n.next(); n.next(); ...
     */

    function parseSecondsFromTimestamp(time) {
        var res = /(\d+)\:(\d+)\:(\d+)/.exec(time);
        if (!res) {
            return null;
        }
        return (((parseInt(res[1], 10) * 60) + parseInt(res[2], 10)) * 60) + parseInt(res[3], 10);
    }

    function getTimeNodes() {
        return document.getElementById("main-panel").getElementsByTagName("pre")[0].getElementsByTagName("b");
    }

    function getNodeTimeDifferenceList() {
        var nodes = getTimeNodes(),
            previousTime = parseSecondsFromTimestamp(nodes[0].textContent),
            differences = [];

        Array.prototype.forEach.call(nodes, function (elem, idx) {
            var newTime = parseSecondsFromTimestamp(elem.textContent);
            if (newTime) {
                differences.push({
                    diff: newTime - previousTime,
                    node: elem
                });
                previousTime = newTime;
            }
        });
        return differences;
    }

    function getMaxDifferencePosition(diffList) {
        var max = diffList[0],
            maxPos = 0;
        diffList.forEach(function (elem, idx) {
            if (elem.diff > max.diff) {
                max = elem;
                maxPos = idx;
            }
        });
        return maxPos;
    }

    function getNextMaxDiff(diffList, curPos) {
        var candidate = null,
            candidateIdx = -1;
        diffList.forEach(function (elem, i) {
            if ((elem.diff < diffList[curPos].diff || (elem == diffList[curPos] && i > curPos)) && (candidate == null || elem.diff >= candidate.diff)) {
                candidate = elem;
                candidateIdx = i;
            }
        });
        return candidateIdx;
    }

    function mark(node) {
        node.scrollIntoView();
        window.scrollTo(window.pageXOffset, window.pageYOffset - 50);
        node.style.backgroundColor = "red";
    }

    function unmark(node) {
        node.style.backgroundColor = "";
    }

    function iterate() {
        var diffList = getNodeTimeDifferenceList(),
            current = getMaxDifferencePosition(diffList);
        mark(diffList[current].node);
        return {
            next: function () {
                unmark(diffList[current].node);
                current = getNextMaxDiff(diffList, current);
                mark(diffList[current].node);
            }
        }
    }

    return iterate();
}

injectInPage.js

var l = document.createElement("script"); l.src = "https://raw.github.com/gist/3852057/4a395c4f57af01f6e26ffb751257967a264a8720/findlamerz.js"; document.getElementsByTagName("body")[0].appendChild(l);