hollow/src/main/java/com/netflix/hollow/core/read/engine/map/HollowMapDeltaApplicator.java [82:118]:
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                    fastDelta();
        else
            slowDelta();


        from.encodedRemovals = null;
        removalsReader.destroy();
    }

    private void slowDelta() {
        for(int i=0; i<=target.maxOrdinal; i++) {
            mergeOrdinal(i);
        }
    }

    private void fastDelta() {
        int i=0;
        int bulkCopyEndOrdinal = Math.min(from.maxOrdinal, target.maxOrdinal);

        while(i <= target.maxOrdinal) {
            int nextElementDiff = Math.min(additionsReader.nextElement(), removalsReader.nextElement());

            if(nextElementDiff == i || i > bulkCopyEndOrdinal) {
                mergeOrdinal(i++);
            } else {
                int recordsToCopy = nextElementDiff - i;
                if(nextElementDiff > bulkCopyEndOrdinal)
                    recordsToCopy = bulkCopyEndOrdinal - i + 1;

                fastCopyRecords(recordsToCopy);

                i += recordsToCopy;
            }
        }
    }

    private void fastCopyRecords(int recordsToCopy) {
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hollow/src/main/java/com/netflix/hollow/core/read/engine/set/HollowSetDeltaApplicator.java [75:111]:
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                    fastDelta();
        else
            slowDelta();

        from.encodedRemovals = null;
        removalsReader.destroy();

    }

    private void slowDelta() {
        for(int i=0; i<=target.maxOrdinal; i++) {
            mergeOrdinal(i);
        }
    }

    private void fastDelta() {
        int i=0;
        int bulkCopyEndOrdinal = Math.min(from.maxOrdinal, target.maxOrdinal);

        while(i <= target.maxOrdinal) {
            int nextElementDiff = Math.min(additionsReader.nextElement(), removalsReader.nextElement());

            if(nextElementDiff == i || i > bulkCopyEndOrdinal) {
                mergeOrdinal(i++);
            } else {
                int recordsToCopy = nextElementDiff - i;
                if(nextElementDiff > bulkCopyEndOrdinal)
                    recordsToCopy = bulkCopyEndOrdinal - i + 1;

                fastCopyRecords(recordsToCopy);

                i += recordsToCopy;
            }
        }
    }

    private void fastCopyRecords(int recordsToCopy) {
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